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914World.com _ 914World Garage _ Sub Woofer Installation

Posted by: ctc911ctc Jan 28 2019, 06:42 PM

All,

Been silent, very cold - garage is a 100 year old Yankee version, no heat.....will not hold any. So, my 17yr old son and I decided to upgrade the speakers (the old ones were absent any cone material).

Found a set of KFC-4675C (kenwood) that fit the spec, integrated mid range and tweeter. Now for the low range. We decided that carving up the car and running a large alternator and battery was not for this car, we are trying to restore it to 80-90 points. So we are using a passive crossover, the original tuner with a power amp that was installed in the 80s, still works (both units are Blauplunkt). We have about 40 watts - more than enough for the size of the car.

When we rebuilt the car we installed sound deadening material in the engine bay, passenger compartment and will put it in the trunk. Amazing how quiet the car seems in the passenger compartment now.

My son had the idea to install the Subwoofer in the engine compartment, cut through the back seat - had to explain the concept of FireWall to him, we looked at a dozen other places and settled on what I think is a very elegant solution.


Our car is a '74 2.0, Silver. So it has a center console. We are installing it there!

Attached Image

First, where should the speaker go????

Attached Image

Wow - no particle board - furniture grade ply!

Attached Image

Peel back the Vinyl, careful!

Attached Image

Counter sync for flush hidden finish

Attached Image

Score the vinyl, perhaps we can STRETCH it!

Attached Image

Heat gun and PULL, gently

Attached Image

Look at that circle, no wood showing, barely a wrinkle!

Attached Image

Add a screen

Attached Image

Bolt that Micro SubWoofer in place

Attached Image

What the Passenger will see

Attached Image

Perfect Fit

Attached Image

Passive Crossover


Will post a note as to how this sounds in a few weeks (months?)


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Posted by: preach Jan 28 2019, 06:54 PM

Pretty good spot.
My Cayman's factory sub is a bump on the left of the p-side footwell.

Posted by: MiniStevieG Jan 28 2019, 07:48 PM

QUOTE(ctc911ctc @ Jan 28 2019, 06:42 PM) *

All,

Been silent, very cold - garage is a 100 year old Yankee version, no heat.....will not hold any. So, my 17yr old son and I decided to upgrade the speakers (the old ones were absent any cone material).

Found a set of KFC-4675C (kenwood) that fit the spec, integrated mid range and tweeter. Now for the low range. We decided that carving up the car and running a large alternator and battery was not for this car, we are trying to restore it to 80-90 points. So we are using a passive crossover, the original tuner with a power amp that was installed in the 80s, still works (both units are Blauplunkt). We have about 40 watts - more than enough for the size of the car.

When we rebuilt the car we installed sound deadening material in the engine bay, passenger compartment and will put it in the trunk. Amazing how quiet the car seems in the passenger compartment now.

My son had the idea to install the Subwoofer in the engine compartment, cut through the back seat - had to explain the concept of FireWall to him, we looked at a dozen other places and settled on what I think is a very elegant solution.


Our car is a '74 2.0, Silver. So it has a center console. We are installing it there!

Attached Image

First, where should the speaker go????

Attached Image

Wow - no particle board - furniture grade ply!

Attached Image

Peel back the Vinyl, careful!

Attached Image

Counter sync for flush hidden finish

Attached Image

Score the vinyl, perhaps we can STRETCH it!

Attached Image

Heat gun and PULL, gently

Attached Image

Look at that circle, no wood showing, bearly a wrinkle!

Attached Image

Add a screen

Attached Image

Both that Micro SubWoofer in place

Attached Image

What the Passenger will see

Attached Image

Perfect Fit

Attached Image

Passive Crossover


Will post a note as to how this sounds in a few weeks (months?)


I love it. Nice work man! Very impressed with your attention to detail. You taking orders?

Posted by: windforfun Jan 28 2019, 07:56 PM

Don't forget to reverse the phase relative to the "full" frequency range loudspeakers. Your crossover may permit this. It can make a huge difference in the sound quality.

Posted by: ConeDodger Jan 28 2019, 08:02 PM

You could have just purchased this already made from 914rubber.com. @http://www.914world.com/bbs2/index.php?showuser=3348 if the are still making them.

Posted by: ctc911ctc Jan 28 2019, 08:18 PM

QUOTE(MiniStevieG @ Jan 28 2019, 08:48 PM) *

QUOTE(ctc911ctc @ Jan 28 2019, 06:42 PM) *

All,

Been silent, very cold - garage is a 100 year old Yankee version, no heat.....will not hold any. So, my 17yr old son and I decided to upgrade the speakers (the old ones were absent any cone material).

Found a set of KFC-4675C (kenwood) that fit the spec, integrated mid range and tweeter. Now for the low range. We decided that carving up the car and running a large alternator and battery was not for this car, we are trying to restore it to 80-90 points. So we are using a passive crossover, the original tuner with a power amp that was installed in the 80s, still works (both units are Blauplunkt). We have about 40 watts - more than enough for the size of the car.

When we rebuilt the car we installed sound deadening material in the engine bay, passenger compartment and will put it in the trunk. Amazing how quiet the car seems in the passenger compartment now.

My son had the idea to install the Subwoofer in the engine compartment, cut through the back seat - had to explain the concept of FireWall to him, we looked at a dozen other places and settled on what I think is a very elegant solution.


Our car is a '74 2.0, Silver. So it has a center console. We are installing it there!

Attached Image

First, where should the speaker go????

Attached Image

Wow - no particle board - furniture grade ply!

Attached Image

Peel back the Vinyl, careful!

Attached Image

Counter sync for flush hidden finish

Attached Image

Score the vinyl, perhaps we can STRETCH it!

Attached Image

Heat gun and PULL, gently

Attached Image

Look at that circle, no wood showing, bearly a wrinkle!

Attached Image

Add a screen

Attached Image

Both that Micro SubWoofer in place

Attached Image

What the Passenger will see

Attached Image

Perfect Fit

Attached Image

Passive Crossover


Will post a note as to how this sounds in a few weeks (months?)


I love it. Nice work man! Very impressed with your attention to detail. You taking orders?



I will ask my boss, the 17 year old in the picture! HA!

Posted by: Mikey914 Jan 29 2019, 02:00 AM

Nice work, but to get decent sound you need to box it in. I’ll post some pics of the one we do so you can see it.
Mark

Posted by: ctc911ctc Jan 29 2019, 09:01 AM

QUOTE(Mikey914 @ Jan 29 2019, 03:00 AM) *

Nice work, but to get decent sound you need to box it in. I’ll post some pics of the one we do so you can see it.
Mark


Hey Mikey,

As to the BOX, the passenger compartment is box enough! At the frequency range we are at, we do not need projection just coupling.

Will post how it sounds, just trying to fill in the 100-1000.

I read that you made these? could not find them on your site.. Link please?

CTC911CTC

Posted by: Chi-town Jan 29 2019, 10:27 AM

There's a guy on ebay who sells this set up too

Posted by: amfab Jan 29 2019, 10:37 AM

QUOTE(ctc911ctc @ Jan 29 2019, 07:01 AM) *

QUOTE(Mikey914 @ Jan 29 2019, 03:00 AM) *

Nice work, but to get decent sound you need to box it in. I’ll post some pics of the one we do so you can see it.
Mark


Hey Mikey,

As to the BOX, the passenger compartment is box enough! At the frequency range we are at, we do not need projection just coupling.

Will post how it sounds, just trying to fill in the 100-1000.

I read that you made these? could not find them on your site.. Link please?

CTC911CTC

If it is not a sealed or ported box you will be putting negative and positive pressure into the box of the passenger compartment simultaneously and the pressure waves will cancel each other out below the frequency at which the open console acts as a small baffle.

-Andrew

Posted by: Chris914n6 Jan 29 2019, 11:54 AM

Speakers need to be in an enclosure to be effective.

Notice how the stock speakers suck for anything but voices, it's because the speaker is essentially in free air. Notice how fuller door speakers sound in modern cars... they have been engineered with the door as the 'box'.
Bose speakers are actually in tuned plastic 'boxes' that are mounted in the doors.

Posted by: dr914@autoatlanta.com Jan 29 2019, 12:09 PM

best to put the sub woofer where the passenger foam block under the bulkhead carpet rests. Works perfectly, cannot tell any difference in the interior appearance:

Posted by: Rand Jan 29 2019, 12:38 PM

QUOTE(dr914@autoatlanta.com @ Jan 29 2019, 10:09 AM) *

best to put the sub woofer where the passenger foam block under the bulkhead carpet rests. Works perfectly, cannot tell any difference in the interior appearance:

Doesn't matter if it's in the footwell or the center console. Both are equally stealth. What matters is the design of the enclosure as has been said here. A speaker enclosure should be air-tight behind. Either place requires fiberglass work to make the box work. If you don't have a tight box you are losing 10x the pleasure (sound) by design. Unplanned innuendo.

Posted by: 914forme Jan 29 2019, 12:45 PM

agree.gif Or ported, band passed, etc....

And then if you want to go deep, we can go into matching the speakers to the enclosure or the enclosure to the speaker and on and on and on....

I think it is a great attempt, now just seal the box and see what you get. Might be good, might be a learning experience, just do not treat it as a failure.

Posted by: Mikey914 Jan 29 2019, 12:54 PM

Not a failure, just brought up the sealing to help improve your product.

Posted by: horizontally-opposed Jan 29 2019, 04:25 PM

QUOTE(dr914@autoatlanta.com @ Jan 29 2019, 10:09 AM) *

best to put the sub woofer where the passenger foam block under the bulkhead carpet rests. Works perfectly, cannot tell any difference in the interior appearance:


If someone makes a box for this—which lost no legroom, I'm interested. Much more appealing than the center console, as it could end up invisible (and I don't have a center console in my car, something I suspect is true for many 914s).

Even a mild bass "box/tube" that was well designed and didn't eat up any more legroom than the foam block would be a nice improvement.

Posted by: ctc911ctc Jan 29 2019, 04:44 PM

QUOTE(amfab @ Jan 29 2019, 11:37 AM) *

QUOTE(ctc911ctc @ Jan 29 2019, 07:01 AM) *

QUOTE(Mikey914 @ Jan 29 2019, 03:00 AM) *

Nice work, but to get decent sound you need to box it in. I’ll post some pics of the one we do so you can see it.
Mark


Hey Mikey,

As to the BOX, the passenger compartment is box enough! At the frequency range we are at, we do not need projection just coupling.

Will post how it sounds, just trying to fill in the 100-1000.

I read that you made these? could not find them on your site.. Link please?

CTC911CTC

If it is not a sealed or ported box you will be putting negative and positive pressure into the box of the passenger compartment simultaneously and the pressure waves will cancel each other out below the frequency at which the open console acts as a small baffle.

-Andrew


Not too concerned, coupling will be ok, Lamda is large, blocking is present.

Thanks, will let you know how it works.
CTC911CTC

Posted by: drem914 Jan 29 2019, 05:11 PM

QUOTE(horizontally-opposed @ Jan 29 2019, 02:25 PM) *

QUOTE(dr914@autoatlanta.com @ Jan 29 2019, 10:09 AM) *

best to put the sub woofer where the passenger foam block under the bulkhead carpet rests. Works perfectly, cannot tell any difference in the interior appearance:


If someone makes a box for this—which lost no legroom, I'm interested. Much more appealing than the center console, as it could end up invisible (and I don't have a center console in my car, something I suspect is true for many 914s).

Even a mild bass "box/tube" that was well designed and didn't eat up any more legroom than the foam block would be a nice improvement.


The sub box you seek is available at 914Rubber.com and a vendor on ebay. Just look up Porsche 914 subwoofer. covered in black or grey perlon, fits an 8" sub.

Posted by: Jonathan Livesay Jan 29 2019, 05:29 PM

I made this one, with a dedicated power amp for the sub and four other speakers it's probably over kill for a concert hall the size of a 914 cockpit. biggrin.gif Attached Image

Posted by: horizontally-opposed Jan 29 2019, 05:55 PM

QUOTE(drem914 @ Jan 29 2019, 03:11 PM) *

The sub box you seek is available at 914Rubber.com and a vendor on ebay. Just look up Porsche 914 subwoofer. covered in black or grey perlon, fits an 8" sub.


^ Many thanks!

Posted by: horizontally-opposed Jan 29 2019, 05:56 PM

QUOTE(Jonathan Livesay @ Jan 29 2019, 03:29 PM) *

I made this one, with a dedicated power amp for the sub and four other speakers it's probably over kill for a concert hall the size of a 914 cockpit. biggrin.gif Attached Image


What size in the factory speaker boxes?? Very interesting...

Posted by: Jonathan Livesay Jan 29 2019, 06:51 PM

QUOTE(horizontally-opposed @ Jan 29 2019, 03:56 PM) *

QUOTE(Jonathan Livesay @ Jan 29 2019, 03:29 PM) *

I made this one, with a dedicated power amp for the sub and four other speakers it's probably over kill for a concert hall the size of a 914 cockpit. biggrin.gif Attached Image


What size in the factory speaker boxes?? Very interesting...

They are Kenwood 4X6 as I recall, the stock mount doesn't leave room for the magnets so I shimmed out the inboard side by about 1/2 inch. The stock grills were in a bunch of parts that I bought at one point and they were already cut up like that, as were the door panels.........I didn't do it! smile.gif

Posted by: horizontally-opposed Jan 29 2019, 08:35 PM

QUOTE(drem914 @ Jan 29 2019, 03:11 PM) *

The sub box you seek is available at 914Rubber.com and a vendor on ebay. Just look up Porsche 914 subwoofer. covered in black or grey perlon, fits an 8" sub.


Was just all over 914rubber.com...have to say it was a bit tough to navigate, but could not find speaker enclosures—this after finding the link that promised them...

https://shop.914rubber.com/Body-Parts_c38.htm

Have a better link? Or...Mikey?

Thanks!

pete

Posted by: SteveL Jan 29 2019, 08:53 PM

Sorry for the hijack but....
I need to replace the 20 year old deck in my 74.
Already have holes in door panels (previous owner, not me).
I know little about car stereos nowadays. I want decent sound. I would like a head unit that can connect bluetooth or at least have an aux in. Is there one that has enough good power output to not need a separate amp for decent sound? What would be good 6" speakers for the door holes?
Thanks

Posted by: Mikey914 Jan 30 2019, 02:15 AM

Just hearing up for another run. Finished off the plywood with bends and sewing up the covers now.

Moving to the new website but here's one we did. Even have the harness that fits directly to the prewirring in the later card to add the 3 gages.


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Posted by: Mikey914 Jan 30 2019, 02:16 AM

More


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Posted by: Mikey914 Jan 30 2019, 02:18 AM

This will allow you to add it later as an option.If you so choose.


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Posted by: Mark Henry Jan 13 2020, 01:02 PM

I have to figure out this as well for my 914. I have the sub box that fits in passenger footwell (morph?) but I don't like it as I'd have to hack the original carpet to make it fit.

So it's either in the console or behind the passenger seat, I didn't really want to run a console, so I'm going to look behind the seat first. I'll remove the 8" sub from the box and see where it fits, that way I can check without investing in a sub right away.

Posted by: Mikey914 Jan 13 2020, 04:09 PM

There is some room in the center section of the 3 piece back pads where the foam currently is. I'd say at the base would be good. I was planning to to do exactly that.

Behind the seats not as much.

Posted by: Mark Henry Jan 14 2020, 07:39 AM

So hacking on the interior, I don't want to cut the carpet for the foot box so obviously this is no go for me. I didn't really want a console but for me it looks like the only solution.

I think I'll also look at having a go at a homebuilt console. I'm not going to hack up the console I have, but I can use it for a pattern. I already have the black vinyl and I just inherited my mom's Bernina sewing machine, so maybe it's a good time to learn how to use it.

What about a round one inch spacer between the speaker and console box? That could give a bit more interior volume and likely not interfere much in the passenger footwell.

Posted by: horizontally-opposed Jan 14 2020, 12:37 PM

QUOTE(Mark Henry @ Jan 14 2020, 05:39 AM) *

So hacking on the interior, I don't want to cut the carpet for the foot box so obviously this is no go for me. I didn't really want a console but for me it looks like the only solution.

I think I'll also look at having a go at a homebuilt console. I'm not going to hack up the console I have, but I can use it for a pattern. I already have the black vinyl and I just inherited my mom's Bernina sewing machine, so maybe it's a good time to learn how to use it.

What about a round one inch spacer between the speaker and console box? That could give a bit more interior volume and likely not interfere much in the passenger footwell.


I had a Kenwood bass wedge in the passenger footwell years ago with a piece of plywood over it...all in lieu of the factory's "wasteful" foam wedge filler used to build out a nice place for the passenger's feet. It worked pretty well, and wasn't obvious visually but it really cut down on passenger legroom...so I removed it.

If I had a center console, or wanted one, the solution in this thread would be my go-to, but I'd dearly love a fiberglass box made to fit the 914 footwell like the factory foam while maximizing air space (upward? or to the right) and properly ported. I'd be interested in something like this if it meant running a smaller bass driver. Some of the home speakers these days make amazing bass from small packages. I wonder if there is even a way to "double port" it to the front trunk for more volume, but must confess I don't know how bass works in that regard.

Not sure making one as a one off makes sense, but it seems like a wonderful product for 914rubber if it's relatively easy to do. Could be furnished in raw fiberglass, and would be instantly reversible if the factory foam block is stored in the garage.

Posted by: Mark Henry Jan 14 2020, 03:57 PM

I have the morph footwell 8" sub enclosure, it does fit the area OK, but you can't install it without cutting up my close to perfect OE carpet. Then you have to protect the woofer with something, the PO had an AL footboard with big ass spacers, you have to be a munchkin because it takes up so much legroom. It came out of the wife's 914, it's likely going back because her carpets are crap, but I'll figure out a better guard for the speaker.

I reason I don't care for the console is because anything but slippers I catch my right foot between the console and brake pedal. I think I'll DYI a console/box but space the speaker hole a bit more rearwards then the one in Mark's above pic. That way I hope I can clearance the right foot area a bit better.

Right now I'm fighting with two 4.0 996 rebuilds that won't let me catch a break, a 914 2056cc stock build that has to be done, need to fully kit out another 2.0 longblock and a 2007cc T1 build. These all have to be done before I can play with my own cars.
dry.gif

Posted by: oakdalecurtis Jan 14 2020, 04:28 PM

"reason I don't care for the console is because anything but slippers I catch my right foot between the console and brake pedal."

Hey Mark, I have size 13 shoes and I too would drag my brake pedal with my right foot. I finally hacksawed the brake pedal off right at the end of the arm, (did it in the car without removing pedal box). Then I welded a short piece of steel 1/4 inch flat stock with 2 predrilled holes to the back of the pedal, offset to the right side of the pedal, as you look at it from the front. Then I welded a small steel gusset between the extension arm and the pedal to add support from pedal pressure being now on one side on the extension arm. Finally I drilled 2 matching holes in the brake pedal arm aligned with the extension holes and bolted it all together on the left side of the brake arm. I have a included a crude diagram below to show the simplicity of the process. It took me about 30 minutes to do, all "in car", and was not as hard as I made it sound. Now my brake pedal has about a half inch clear on the side of my big shoes, and makes a real pleasurable difference driving the car.

Attached Image

Posted by: burton73 Jan 14 2020, 04:40 PM

QUOTE(dr914@autoatlanta.com @ Jan 29 2019, 10:09 AM) *

best to put the sub woofer where the passenger foam block under the bulkhead carpet rests. Works perfectly, cannot tell any difference in the interior appearance:



Not so good with a 1970 or 71 car


Bob B

Posted by: R Dub Jan 18 2020, 02:03 PM

ctc911ctc what sub did you go with? Also have you installed it yet? If so how does it sound?

Posted by: horizontally-opposed Jan 18 2020, 07:25 PM

Maybe a stupid question, but: Could the doors be used more effectively when it comes to bass? I'm wondering if a 6.5 in the door with a small port tube venting back into the interior (by the back of the door, near the seat?) would work better than simply placing the speaker in the usual spot?

I am also wondering if one might figure out a way to mount said 6.5 behind the door panel and then make holes between the bricks in the door card's basketweave in a (perhaps compromised) version of the speaker holes seen in early 928s.

Just thinking out loud here; not sure what the ramifications would be in audio terms. If we have any audio experts, I'd love to hear from them.

Posted by: ctc911ctc Jan 18 2020, 10:14 PM

How does it sound?

In the 70's I worked at Miller Audio on Wilshire in Beverly Hills. They made subwoofers called the M&K 1, then 2, then 3, etc. The drivers were suspended speakers and needed an unported enclosure. Took one home and paired it with two satellite speakers from Pyramid. $$$$$


I then studied EE and always read the acoustic proceedings of the IEEE. When I started making money I spent a great deal on audiophile-grade components chasing THD, sonic coupling and other audiophile absurdities seeking the perfect sound. Back at Miller audio, they started pressing Direct-to-Disk recordings to also chase the perfect sound. Such a holy grail.

My ears are now old - the sub-woofer in the car sounds great to me and my 18-year-old son who did the work loves the sound.

All that said for the following. In a small enclosure, a lot of what has been said on this thread is not necessary. We used a driver that did not require acoustic suspension (airtight enclosure) since it is very stiffly suspended, We used the middle counsel as the enclosure with the ports being the top and front opening. Bass waves at 10-300hz are very large, so getting great bass in such a small space and driver is difficult. Most audio engineers use acoustic coupling to the entire car just to get close to a small fraction of Lamda. However, we spent a great deal of time welding the car back together so I am against putting an audio jackhammer inside the car assaulting every component of the automobile.

Here is the driver we used:
https://www.amazon.com/gp/product/B00NHTXXNM/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

Also, we used a passive crossover and a 400-watt amp (peak) - make certain the amp only goes on when you are using it - ask me why I say this! headbang.gif

What I like most is not having to cut the car apart (holes in the doors) - we put in new Jenson speakers within the original enclosure and also used the original radio to turn on the power amp and to play the radio, though my son plays his phone most of the time. 70's rock is his favorite - Seriously!

Send pictures of your system and your decisions.....

No matter what you do, you probably won't listen very often, the engine sounds too cool! A good friend has a Ferrari with a very high-end audio system installed. When I asked him how it sounds he replied that he never turned it on.......then we went through a tunnel.......THAT'S MUSIC..........ahhhhh biggrin.gif biggrin.gif







QUOTE(R Dub @ Jan 18 2020, 03:03 PM) *

ctc911ctc what sub did you go with? Also have you installed it yet? If so how does it sound?


Posted by: gereed75 Jan 19 2020, 09:57 AM

I know this is a DIY spirited kind of thread, but this seems like a pretty straightforward solution

https://www.amazon.com/Rockville-RockGhost-Hidden-Powered-Subwoofer/dp/B07V4LXVFK/ref=sr_1_1_sspa? gclid=CjwKCAiAsIDxBRAsEiwAV76N804RZrJJ6NZf7LdFEoT0FSGQEeTE_IP5D27Mzy57OzgyTLatB0
morBoC2KIQAvD_BwE&hvadid=190517651023&hvdev=t&hvlocphy=9012213&hvnetw=g&hvqmt=e&hvrand=16528454611911906780&hvtargid=aud-835997443427%3Akwd-366955768757&hydadcr=18251_9816338&keywords=spare+tire+subwoofer&qid=1579230157&sr=8-1-spons&psc=1& amp;spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzSTBaMU1STDdNNzFLJmVuY3J5cHRlZElkPUEwMDIwNjU
0MzZNRU40MEVVWlRMSiZlbmNyeXB0ZWRBZElkPUEwMzE3MTcxMlBCREU3UzNWUlhSSiZ3aWRnZXROYW1
lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

Anybody ever try one?

Posted by: 914forme Jan 19 2020, 09:59 AM

the trunk is semi sealed from the cabin.

You using this to keep mice out of the car.

Posted by: FlacaProductions Jan 19 2020, 11:26 AM

I'm away from my 914 for extended periods so I do a lot of research/reading in the meantime - wondering if something like this would fit under our seats?

https://www.amazon.com/gp/product/B019Z3RFGY/ref=ask_ql_qh_dp_hza

Dimensions: 12.4 x 11 x 2.7

Posted by: tomeric914 Jan 19 2020, 11:54 AM

These are all great suggestions to the OP, but he did this with his son as a project. That system will sound amazing for years to come. You can't buy that kind of quality anywhere. wub.gif

Posted by: Chris914n6 Jan 19 2020, 03:06 PM

QUOTE(FlacaProductions @ Jan 19 2020, 09:26 AM) *

I'm away from my 914 for extended periods so I do a lot of research/reading in the meantime - wondering if something like this would fit under our seats?

https://www.amazon.com/gp/product/B019Z3RFGY/ref=ask_ql_qh_dp_hza

Dimensions: 12.4 x 11 x 2.7

L & W yes but the seat is only 1" or so above the floorpan. I did put an amp under the pass seat years ago by adding spacers to the rear mount and a bit of indenting the floor. smash.gif


Posted by: FlacaProductions Jan 19 2020, 04:15 PM

Dang- that's what I thought

Posted by: steuspeed Jan 19 2020, 06:14 PM

QUOTE(horizontally-opposed @ Jan 18 2020, 06:25 PM) *

Maybe a stupid question, but: Could the doors be used more effectively when it comes to bass? I'm wondering if a 6.5 in the door with a small port tube venting back into the interior (by the back of the door, near the seat?) would work better than simply placing the speaker in the usual spot?

I am also wondering if one might figure out a way to mount said 6.5 behind the door panel and then make holes between the bricks in the door card's basketweave in a (perhaps compromised) version of the speaker holes seen in early 928s.

Just thinking out loud here; not sure what the ramifications would be in audio terms. If we have any audio experts, I'd love to hear from them.


You could do a 3 way separate system. One Idea I had for my car with already cut door panels. Buy a 3 way kit. Use the tweet and mid under the stock grill and the woofer in the door.

Posted by: Chris914n6 Jan 23 2020, 12:06 AM

QUOTE(FlacaProductions @ Jan 19 2020, 02:15 PM) *

Dang- that's what I thought

Peaked my interest enough to get crafty. The Rockwell ss8p is a better fit.
Between the seat rail.
Custom center console.
Under the dash with and without the glove box.

IPB Image

IPB Image

IPB Image

IPB Image

IPB Image

Posted by: horizontally-opposed Jan 23 2020, 12:39 AM

It's seriously tricky.

Everything I've tried in the footwell either crimps toe space or foot space. I'd love a really well designed, sealed fiberglass bass box built to replace the factory foam...but not sure it would work? Or would it? Suspect the bass speaker would have to be pretty small, and maybe the enclosure would have to be modeled on some of the bass-creating "boxes" from major brands. I had one of those that was actually shaped as a wedge that went into that space pretty well, but it was old, tired, and probably moisture-damaged.

Which has moved me back to seeing what's possible to do with the doors...whether they would benefit from a rigidly mounted 6.5 and maybe even with a port someplace else on the door. Not sure the door is sealed "enough" to make that port worth it.

I sometimes look at this stuff, at 12x13x2.7 inches (or thereabouts), but it's usually powered... https://www.amazon.com/dp/B019Z3R582/ref=psdc_2230642011_t2_B01FV0IAQO

Posted by: messix Jan 24 2020, 01:16 AM

check this thread out.

my sub box that is now sold by 914rubbers is in post 15 and 16/

it's a good tight bass with good volume.

http://www.914world.com/bbs2/index.php?showtopic=62249&hl=subwoofer

Posted by: FlacaProductions Jan 24 2020, 09:34 AM

@http://www.914world.com/bbs2/index.php?showuser=3931 - I think that's the way to go but I can't find it on 914Rubber's site. @http://www.914world.com/bbs2/index.php?showuser=3348 ?

Posted by: dr914@autoatlanta.com Jan 24 2020, 10:12 AM

the best place is to put a sub woofer is where the foam floor board block exists on the passenger side. Totally hidden, takes up no space, sounds GREAT and does not chop up the car. Here is a picture if anyone wants to make one: http://www.autoatlanta.com/Porsche-914-Speaker-System-Bass-Sub-Woofer-Plate-Parts-PN-BAA31934.html

It is very easy to make, basically the pattern of the block with a leg to support it. We have made hundreds over the years and the sound is great, and TOTALLY hidden


Posted by: Rand Jan 24 2020, 11:26 AM

I can vouch for Troy's setup. It kicks.

Posted by: horizontally-opposed Jan 24 2020, 11:45 AM

QUOTE(dr914@autoatlanta.com @ Jan 24 2020, 08:12 AM) *

the best place is to put a sub woofer is where the foam floor board block exists on the passenger side. Totally hidden, takes up no space, sounds GREAT and does not chop up the car. Here is a picture if anyone wants to make one: http://www.autoatlanta.com/Porsche-914-Speaker-System-Bass-Sub-Woofer-Plate-Parts-PN-BAA31934.html

It is very easy to make, basically the pattern of the block with a leg to support it. We have made hundreds over the years and the sound is great, and TOTALLY hidden


This isn't an ideal solution. A subwoofer will perform far better in a sealed and ported enclosure. But it might be better than nothing.…

QUOTE(messix @ Jan 23 2020, 11:16 PM) *

check this thread out.

my sub box that is now sold by 914rubbers is in post 15 and 16/

it's a good tight bass with good volume.

http://www.914world.com/bbs2/index.php?showtopic=62249&hl=subwoofer


^ THIS is the way to go, or at least the way I'd like to go. The first one shows how the box should be done, while the second and third are more appealing to those of us who want a truly stealth setup. How to the ones where you can't see the subwoofer sound?

And you say they're available from 914Rubber? idea.gif


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Posted by: drem914 Jan 24 2020, 11:58 AM

QUOTE(horizontally-opposed @ Jan 24 2020, 09:45 AM) *

QUOTE(dr914@autoatlanta.com @ Jan 24 2020, 08:12 AM) *

the best place is to put a sub woofer is where the foam floor board block exists on the passenger side. Totally hidden, takes up no space, sounds GREAT and does not chop up the car. Here is a picture if anyone wants to make one: http://www.autoatlanta.com/Porsche-914-Speaker-System-Bass-Sub-Woofer-Plate-Parts-PN-BAA31934.html

It is very easy to make, basically the pattern of the block with a leg to support it. We have made hundreds over the years and the sound is great, and TOTALLY hidden


This isn't an ideal solution. A subwoofer will perform far better in a sealed and ported enclosure. But it might be better than nothing.…

QUOTE(messix @ Jan 23 2020, 11:16 PM) *

check this thread out.



my sub box that is now sold by 914rubbers is in post 15 and 16/

it's a good tight bass with good volume.

http://www.914world.com/bbs2/index.php?showtopic=62249&hl=subwoofer


^ THIS is the way to go, or at least the way I'd like to go. The first one shows how the box should be done, while the second and third are more appealing to those of us who want a truly stealth setup. How to the ones where you can't see the subwoofer sound?

And you say they're available from 914Rubber? idea.gif


what do you do to protect the sealed box speaker (lower left) from feet?

Posted by: 914forme Jan 24 2020, 12:24 PM

@horrizontally-opposed Pete, I have picked a JL Audio sub to try in that area. My plan is to take lay some foil wrap into the area, and then work my way out with fiberglass, build a sealed enclosure, and it will be protected with one of the perforated Aluminum plate foot boards. I will be painting or anodizing it black, and adding traction tape over it, leaving the holes exposed. Most likely add a sound Matt of the back side to reduce the opportunity for the AL plate to vibrate. That would annoy the stromberg.gif out of me.

The JL sub I picked at @http://www.914world.com/bbs2/index.php?showuser=20845 suggestion requires ~0.35 cu.ft. for a sealed box. Ported would be a bit larger. I will most likely do a sealed, as ports tend to enhance certain frequencies, and since I don't just play one key of music, I do not need to tune the system.

Tuned ports would be handy for Gregorian chant.

Posted by: Mikey914 Jan 24 2020, 01:22 PM

QUOTE(FlacaProductions @ Jan 24 2020, 07:34 AM) *

@http://www.914world.com/bbs2/index.php?showuser=3931 - I think that's the way to go but I can't find it on 914Rubber's site. @http://www.914world.com/bbs2/index.php?showuser=3348 ?

We are actually retooling on these right now. I'd be happy to post up a GB but these are 4-5 weeks from being ready. I could do the
Shell only at $66 if I could get 10 takers. I may even be able to get it lower but depends on how many are interested.

I'll post up a GB shortly.

Posted by: Johny Blackstain Jan 24 2020, 01:28 PM

QUOTE(Mikey914 @ Jan 24 2020, 02:22 PM) *

We are actually retooling on these right now. I'd be happy to post up a GB but these are 4-5 weeks from being ready. I could do the
Shell only at $66 if I could get 10 takers. I may even be able to get it lower but depends on how many are interested.

I'll post up a GB shortly.

Any old style center consoles with a sub? If so, can I get one in cinnamon carpeting? Also, has to have room for my gauges. Asking a lot, I know biggrin.gif




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Posted by: horizontally-opposed Jan 24 2020, 01:41 PM

QUOTE(Mikey914 @ Jan 24 2020, 11:22 AM) *

We are actually retooling on these right now. I'd be happy to post up a GB but these are 4-5 weeks from being ready. I could do the
Shell only at $66 if I could get 10 takers. I may even be able to get it lower but depends on how many are interested.

I'll post up a GB shortly.


Nice!!

Count me in—particularly if 1) factory looks are retained, 2) there is no or very little cost in passenger legroom (as there was with my last homemade setup), and 3) the shell comes set up to take an 8-inch speaker that can be carpeted over to be invisible.

Posted by: horizontally-opposed Jan 24 2020, 01:44 PM

QUOTE(914forme @ Jan 24 2020, 10:24 AM) *

@horrizontally-opposed Pete, I have picked a JL Audio sub to try in that area. My plan is to take lay some foil wrap into the area, and then work my way out with fiberglass, build a sealed enclosure, and it will be protected with one of the perforated Aluminum plate foot boards. I will be painting or anodizing it black, and adding traction tape over it, leaving the holes exposed. Most likely add a sound Matt of the back side to reduce the opportunity for the AL plate to vibrate. That would annoy the stromberg.gif out of me.

The JL sub I picked at @http://www.914world.com/bbs2/index.php?showuser=20845 suggestion requires ~0.35 cu.ft. for a sealed box. Ported would be a bit larger. I will most likely do a sealed, as ports tend to enhance certain frequencies, and since I don't just play one key of music, I do not need to tune the system.

Tuned ports would be handy for Gregorian chant.


Sounds like a slick setup. I am planning to use a JL 5-channel amp to power a JL 3-speaker component system for the stock speaker pods and doors, with the possibility of rear "fill" tweeters in the targa bar and the fifth channel for a sub. Was "arming" my old Pioneer amp via a factory 914 defroster switch on the dash (found an old one at EASY), which lit up when you pulled it out to tell you the audio system was on, and then using AUX in to plumb by iPhone in with RCA cables. Worked really nicely, but may go to Bluetooth for the next iteration of this setup. Just need a place to put that sub. Have looked at some of the slim-line subs out there, but so many of them are powered. Would love to see what you come up with.

And good point on the port tube. I may reference the size of the port tube in an old JBL bass tube I think I still have, and just go with that. Any bass setup is gonna improve on no bass setup, and I suspect JBL did some homework on the size of that tube vs the 8-inch subwoofer.

My goal is to have "invisible" audio that actually sounds good, with the only clue that there's a system being 6.5s as the front of the doors. With 914Rubber's ABS plastic door card blanks, I've started to wonder if the 6.5s could be mounted behind the door cards with "perforated" basketweave vinyl over them...much like the early 928 speakers (see below). On black, you might not even notice the holes in the basketweave. Thoughts? Good idea? Terrible idea? unsure.gif





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Posted by: Mikey914 Jan 24 2020, 01:47 PM

QUOTE(Johny Blackstain @ Jan 24 2020, 11:28 AM) *

QUOTE(Mikey914 @ Jan 24 2020, 02:22 PM) *

We are actually retooling on these right now. I'd be happy to post up a GB but these are 4-5 weeks from being ready. I could do the
Shell only at $66 if I could get 10 takers. I may even be able to get it lower but depends on how many are interested.

I'll post up a GB shortly.

Any old style center consoles with a sub? If so, can I get one in cinnamon carpeting? Also, has to have room for my gauges. Asking a lot, I know biggrin.gif

Not in stock, but if I have the correct material I'd be happy to make something up.

The proble. Is the early is more of a catch tray, without much behind it.

If your interested PM me your address so I can send a sample assuring the material is correct.
Thx
Mark

Posted by: burton73 Jan 24 2020, 01:51 PM

Posted on my 6 build.

From Eric @PMB:

 Testing fitment. Your custom German square weave would cover all of this. Mounting plate would be made to limit intrusion on the body. So far is shy of where the factory foam pieces would go so... all good.


This is the sub that we are using with a Bluetooth control so I can use my phone for a sound library. Fit should look just like a 72 interior as far as the footrest goes. This should sound good


Bob B


http://www.914world.com/bbs2/index.php?showtopic=307620&st=200



[attachmentid=727428]

Hi Johnny,

Dale my interior man is building a new 1970 style center console and PMB decided that this was the best set up.

Bob BAttached Image Attached Image

Posted by: FlacaProductions Jan 24 2020, 03:43 PM

What Pete said.

Posted by: bbrock Jan 24 2020, 09:17 PM

QUOTE(914forme @ Jan 24 2020, 11:24 AM) *

@horrizontally-opposed Pete, I have picked a JL Audio sub to try in that area. My plan is to take lay some foil wrap into the area, and then work my way out with fiberglass, build a sealed enclosure, and it will be protected with one of the perforated Aluminum plate foot boards. I will be painting or anodizing it black, and adding traction tape over it, leaving the holes exposed. Most likely add a sound Matt of the back side to reduce the opportunity for the AL plate to vibrate. That would annoy the stromberg.gif out of me.

The JL sub I picked at @http://www.914world.com/bbs2/index.php?showuser=20845 suggestion requires ~0.35 cu.ft. for a sealed box. Ported would be a bit larger. I will most likely do a sealed, as ports tend to enhance certain frequencies, and since I don't just play one key of music, I do not need to tune the system.

Tuned ports would be handy for Gregorian chant.


popcorn[1].gif Looking forward to learning how this turns out. My Infinity Kappas arrived this week so I'll be making adapter plates to fit the stock grills. I'm almost for sure going to use that same sub. I downloaded the manual and saw they have detailed specs for sealed and ported boxes (including tubes). Planned to do some measuring maybe this weekend. I was afraid the bass from a ported box might be a bit too much. I'm not looking to pimp my ride. But now that you mention Gregorian chant, I'm thinking how ported would sound with my Australian Aborigine didge music... idea.gif

Posted by: bbrock Feb 9 2020, 11:10 PM

QUOTE(Mikey914 @ Jan 24 2020, 12:22 PM) *

QUOTE(FlacaProductions @ Jan 24 2020, 07:34 AM) *

@http://www.914world.com/bbs2/index.php?showuser=3931 - I think that's the way to go but I can't find it on 914Rubber's site. @http://www.914world.com/bbs2/index.php?showuser=3348 ?

We are actually retooling on these right now. I'd be happy to post up a GB but these are 4-5 weeks from being ready. I could do the
Shell only at $66 if I could get 10 takers. I may even be able to get it lower but depends on how many are interested.

I'll post up a GB shortly.


@http://www.914world.com/bbs2/index.php?showuser=3348 was this GB ever posted? I'd be interested in a shell.

Posted by: Mikey914 Feb 10 2020, 01:42 AM

We are in the process of changing up some tooling, so I had not, but yes we will.

Give me a few days and I can get posted up.
Mark

Posted by: tvdinnerbythepool Feb 10 2020, 10:37 AM

@http://www.914world.com/bbs2/index.php?showuser=3348 count me in!

Posted by: Chris914n6 Feb 10 2020, 01:26 PM

8" ?
what's the internal volume?

Looks about right for a small box sealed 8" I have, and I hate working with fiberglass beerchug.gif


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Posted by: horizontally-opposed Feb 10 2020, 02:01 PM

QUOTE(Chris914n6 @ Feb 10 2020, 11:26 AM) *


IPB Image


^ This setup, but with an 8-inch (or smaller) sub without the periscope and the same size as the foam pad would be a fabulous add to the 914. If you do this Mark, count me in...

Posted by: Chris914n6 Feb 10 2020, 04:17 PM

QUOTE(horizontally-opposed @ Feb 10 2020, 12:01 PM) *

QUOTE(Chris914n6 @ Feb 10 2020, 11:26 AM) *


IPB Image


^ This setup, but with an 8-inch (or smaller) sub without the periscope and the same size as the foam pad would be a fabulous add to the 914. If you do this Mark, count me in...

Actually that has been on the market, but the box is thicker by 1-2" because the 8" sub is deeper than the foam block. Plus the air space needed so the speaker actually works right.

I like the 'periscope' design as a good compromise as it keeps the foot space as is.

A 6.5" in a ported box might be a good compromise for the given space.

Posted by: horizontally-opposed Feb 15 2020, 07:58 PM

Another idea...shallow-mount Pioneer sub designed to operate in free air, for $72, at 7 inches in diameter by 2.63 inches deep.

https://www.amazon.com/Pioneer-TS-SW2002D2-8-inch-Shallow-Mount-Subwoofer/dp/B00JQTU434/ref=pd_ybh_a_3?_encoding=UTF8&psc=1&refRID=JM4SPDXFFCC5Y4861TVM

Curious to hear others' thoughts on this...or whether 914rubber's setup might even enhance this? The idea of a sub in place of the footrest foam—without losing any legroom—remains highly appealing.


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Posted by: horizontally-opposed Feb 15 2020, 08:37 PM

Also interesting, at $92…

https://www.amazon.com/dp/B0167KQX9S/ref=psdc_1294866011_t2_B00VT9ZZD8





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Posted by: 914forme Feb 16 2020, 05:27 PM

the 12" version of the infinity gets really good reviews, for performance, very interesting design.

Posted by: Mikey914 Feb 16 2020, 08:17 PM

Yes we will be providing just the vented unit, you can install your choice of sub. It will be interesting to see how they all compare.

Posted by: 911GT2 Feb 17 2020, 07:05 AM

Maybe it's a bit against the purpose of this thread but years ago in my smart-car I used the predecessor of what is now the https://www.pioneer-car.eu/nl/nl/products/ts-wx210a.

It's an active subwoofer which sounds more than adequate, especially in such a small space. And it's easy to hide I guess.

Posted by: ConeDodger Feb 17 2020, 09:48 AM

Here’s my sub. Fiberglass box replaces foam block in passenger footwell. 8” sub with an amp and I get pretty good sound.


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Posted by: maf914 Feb 18 2020, 03:59 PM

QUOTE(911GT2 @ Feb 17 2020, 05:05 AM) *

Maybe it's a bit against the purpose of this thread but years ago in my smart-car I used the predecessor of what is now the https://www.pioneer-car.eu/nl/nl/products/ts-wx210a.

It's an active subwoofer which sounds more than adequate, especially in such a small space. And it's easy to hide I guess.


It appears Pioneer has a similar sub currently, TS-WX130DA.

https://www.amazon.com/Pioneer-TS-WX130DA-Compact-Active-subwoofer/dp/B078PHCHSW/ref=sr_1_fkmr0_1?keywords=pioneer+TS-WX210A+subwoofer&qid=1582062549&sr=8-1-fkmr0

https://www.pioneerelectronics.com/PUSA/Car/Subwoofers/Powered+Subwoofer/TS-WX130DA


Posted by: horizontally-opposed Feb 18 2020, 04:32 PM

QUOTE(ConeDodger @ Feb 17 2020, 07:48 AM) *

Here’s my sub. Fiberglass box replaces foam block in passenger footwell. 8” sub with an amp and I get pretty good sound.


Nice install, Rob!

Any detriment to passenger legroom? I had a similar setup, but I could have and should have done better on legroom...

Posted by: bbrock Mar 13 2020, 11:15 AM

QUOTE(Mikey914 @ Feb 10 2020, 12:42 AM) *

We are in the process of changing up some tooling, so I had not, but yes we will.

Give me a few days and I can get posted up.
Mark


Any news on this? popcorn[1].gif Baby needs her bass... biggrin.gif

Posted by: BeatNavy Mar 13 2020, 11:29 AM

QUOTE(bbrock @ Mar 13 2020, 01:15 PM) *

Any news on this? popcorn[1].gif Baby needs her bass... biggrin.gif

lol-2.gif

Me, too. I just got back from running an errand with my 914. Beautiful day, open road, top off, car driving beautifully, and Rainbow's "Since You Been Gone" blaring on my play list. At least I think it was. The sound was so tinny I couldn't be sure blink.gif hissyfit.gif

Posted by: bbrock Mar 26 2020, 10:49 PM

Thought I would report that the JL Audio sub mentioned earlier in this thread does NOT fit as a stealth installation. The magnet is just about 1/4" too large in diameter to fit into the footwell foam space. If you are willing to give up about an inch of footwell space, it would work, but I'm not. I'm sending mine back and will get one of these instead:

IPB Image
https://www.crutchfield.com/p_575P3SD28/Rockford-Fosgate-P3SD2-8.html?tp=68847

The JL sounded really nice though. Even just using a cardboard box for an enclosure, it paired very nicely with my Infinity speakers.

@http://www.914world.com/bbs2/index.php?showuser=3348 Any progress on those enclosures? Will there be a sealed enclosure option? I'm guessing the port could be sealed up easy enough, but curious.

Posted by: ConeDodger Mar 27 2020, 01:44 AM

QUOTE(horizontally-opposed @ Feb 18 2020, 07:32 PM) *

QUOTE(ConeDodger @ Feb 17 2020, 07:48 AM) *

Here’s my sub. Fiberglass box replaces foam block in passenger footwell. 8” sub with an amp and I get pretty good sound.


Nice install, Rob!

Any detriment to passenger legroom? I had a similar setup, but I could have and should have done better on legroom...


Well, they have to keep their feet off the speaker grill but it is just the foam block replaced with a fiberglass sub enclosure.

Posted by: IronHillRestorations Mar 27 2020, 07:06 AM

I don't know why one would have to go to such a large driver to get decent bass response. I did a budget stereo install on my '91 Targa for $600 that included a Kenwood powered sub, an Alpine front end and small amp with Rockford-Fosgate speakers. I know Infinity and JL are far superior components, but I've got two in college. The powered sub is good enough for me. It's not competition level bass, but I don't need that anymore (I save the hearing damage for jams).

The point is that I don't think you've got to go with a large sub to get decent bass.

As a side note; what happened to EQ's?
I loved being able to adjust the the EQ when I took the roof off my 914. I had an Alphasonik 7 band that fit the center console and worked great. Most front ends now have some EQ, but what can you do with a 3 band parametric??

Posted by: Mikey914 Mar 27 2020, 09:11 AM

QUOTE(bbrock @ Mar 26 2020, 09:49 PM) *

Thought I would report that the JL Audio sub mentioned earlier in this thread does NOT fit as a stealth installation. The magnet is just about 1/4" too large in diameter to fit into the footwell foam space. If you are willing to give up about an inch of footwell space, it would work, but I'm not. I'm sending mine back and will get one of these instead:

IPB Image
https://www.crutchfield.com/p_575P3SD28/Rockford-Fosgate-P3SD2-8.html?tp=68847

The JL sounded really nice though. Even just using a cardboard box for an enclosure, it paired very nicely with my Infinity speakers.

@http://www.914world.com/bbs2/index.php?showuser=3348 Any progress on those enclosures? Will there be a sealed enclosure option? I'm guessing the port could be sealed up easy enough, but curious.

Actually,
Been a bit busy at the day job working as many hours as they will let me. These are still on the list, but just on hold for a bit.
mark

Posted by: FlacaProductions Mar 27 2020, 10:14 AM

Keep in mind that i'm away from my 914 so trying to work this out in my head - do I have access to the foam if I simply pull the carpet from the front wall of the passenger footwell - and then the foam simply lifts out?

Posted by: bbrock Mar 27 2020, 10:34 AM

QUOTE(FlacaProductions @ Mar 27 2020, 09:14 AM) *

Keep in mind that i'm away from my 914 so trying to work this out in my head - do I have access to the foam if I simply pull the carpet from the front wall of the passenger footwell - and then the foam simply lifts out?


Yep. The front wall carpet gets pinned behind the center console (if you have one) and right speaker pod so you may have to remove the pod or do a little tugging to get enough slack from behind the console to free the foam, but it isn't a difficult operation at all.

Posted by: FlacaProductions Mar 27 2020, 10:48 AM

Great - following this closely and appreciate your input and blazing the trail. I'm looking to do the totally stealth version and I think all I need is a template to cut the board that replaces the foam.

Posted by: bbrock Mar 27 2020, 10:57 AM

I haven't found a powered sub that will fit for a truly stealth installation or I probably would go that route. Clearance under the seats is too low and the foot well space is a funky shape. You might be able to get close though. I looked at 6" subs but wasn't too impressed. Even in high school and college, I never liked loud thumping bass that muddied and overwhelmed the music. I just want something that delivers crisp punch at moderate volumes to round out the bottom end. Anything over 8 inches won't fit into the space occupied by the foam and even then, motor depth becomes an issue. I also want to recess the mounting ring enough that I can install a strong expanded metal grill flush to the surface so I don't have to worry about feet destroying the sub.

Posted by: bbrock Mar 27 2020, 03:26 PM

QUOTE(FlacaProductions @ Mar 27 2020, 09:48 AM) *

Great - following this closely and appreciate your input and blazing the trail. I'm looking to do the totally stealth version and I think all I need is a template to cut the board that replaces the foam.


Do you plan to seal the resulting enclosure? It is easy enough to cut a board that fits like the foam to mount a sub and I think George even sells them. The problem is figuring out how to seal the space to create a proper sub enclosure. Otherwise the sub is just running in free air space. That Pioneer posted earlier might work in that case. After thinking through all the options, I decided Mark's enclosure is by far the best. He just needs to get his priorities straight and focus on our trivial entertainment desires rather than putting bread on the table. lol-2.gif

Posted by: FlacaProductions Mar 27 2020, 03:54 PM

I think free air if at all possible...and I wish George would just sell that board but I don't see it offered solo on the site - but I seem to always have trouble on that site.

I'd really be interested in a turn-key, stealth solution but not to the extent George offers - I don't need/want the woofer or amp - just the mounting solution...

Posted by: Porschef Mar 27 2020, 04:48 PM

I had made an enclosure for a passenger footwell sub but then ended up simply strapping a Bazooka under the dash on the passenger side. Simple install, driven by a dedicated R/F amp.

Works pretty well.

Posted by: bbrock Mar 27 2020, 06:09 PM

QUOTE(FlacaProductions @ Mar 27 2020, 02:54 PM) *

I think free air if at all possible...and I wish George would just sell that board but I don't see it offered solo on the site - but I seem to always have trouble on that site.

I'd really be interested in a turn-key, stealth solution but not to the extent George offers - I don't need/want the woofer or amp - just the mounting solution...


For what its worth, I cut a board matching the foam profile last night from MDF as a temporary mount and test the fit. It only took about 30-45 minutes to mark up and cut out. If free air works for you, it's a piece of cake. Hard part is getting that sucker mounted so it has clearance. My second sub is already on its way so we'll see how that goes.

Posted by: bbrock May 5 2020, 12:35 PM

Posted this on my build thread a month ago but figured I'd update here. I think the Rockford-Fosgate sub will work in the foot well location. I just have it mounted on a cheezie temporary board for not until I can get that awesome enclosure Mark is working on poke.gif

IPB Image

With the enclosure, I'll rig a flush mount with a sturdy grill to keep feet from poking through. I might have to sacrifice about 1/2" of foot space to make it completely flush but won't know for sure until I have the box. Even with the cobbled setup, it is pretty stealth.

IPB Image

Sound-wise, I liked the JL Audio sub better but this is pretty nice after it got broken in a little. It's a bit wimpy running free-air on that board though so I'm really looking forward to having an enclosure so I can button this up.

Posted by: horizontally-opposed May 5 2020, 01:19 PM

QUOTE(bbrock @ May 5 2020, 11:35 AM) *

Posted this on my build thread a month ago but figured I'd update here. I think the Rockford-Fosgate sub will work in the foot well location. I just have it mounted on a cheezie temporary board for not until I can get that awesome enclosure Mark is working on poke.gif

IPB Image

With the enclosure, I'll rig a flush mount with a sturdy grill to keep feet from poking through. I might have to sacrifice about 1/2" of foot space to make it completely flush but won't know for sure until I have the box. Even with the cobbled setup, it is pretty stealth.

IPB Image

Sound-wise, I liked the JL Audio sub better but this is pretty nice after it got broken in a little. It's a bit wimpy running free-air on that board though so I'm really looking forward to having an enclosure so I can button this up.


Nice work, and thanks for posting.

How much legroom lost? I had a similar setup, but it was covering a Pioneer bass wedge and it lost a couple of inches of leg room...which was too much.

Posted by: bbrock May 5 2020, 06:18 PM

QUOTE(horizontally-opposed @ May 5 2020, 01:19 PM) *

Nice work, and thanks for posting.

How much legroom lost? I had a similar setup, but it was covering a Pioneer bass wedge and it lost a couple of inches of leg room...which was too much.


I'm hoping for zero legroom lost but will have to wait for the sub enclosure that replaces the foot well foam to see. Right now the board the sub is mounted on is in the same location as the front of the foam block. As you can see, the sub is surface mounted right now but I think I'll be able to mount it flush for a zero loss installation. As you know, that is an awkward space and there is a small cavity to tuck the magnet into even on a shallow mount sub. I know enough at this point that this install will lose a max of 3/4" leg room but probably less.

Posted by: bbrock May 31 2020, 08:05 PM

QUOTE(Mikey914 @ Jan 24 2020, 01:22 PM) *

QUOTE(FlacaProductions @ Jan 24 2020, 07:34 AM) *

@http://www.914world.com/bbs2/index.php?showuser=3931 - I think that's the way to go but I can't find it on 914Rubber's site. @http://www.914world.com/bbs2/index.php?showuser=3348 ?

We are actually retooling on these right now. I'd be happy to post up a GB but these are 4-5 weeks from being ready. I could do the
Shell only at $66 if I could get 10 takers. I may even be able to get it lower but depends on how many are interested.

I'll post up a GB shortly.

icon_bump.gif @http://www.914world.com/bbs2/index.php?showuser=3348

Any update on this one? I know you have a lot of irons in the fire. Hoping this one is still warm beerchug.gif

Posted by: Mikey914 May 31 2020, 11:32 PM

Yes we have a prototype we've made and we are completing tooling. Plan for an announcement in about 14 days.
Mark

Posted by: bbrock Jun 1 2020, 07:15 AM

QUOTE(Mikey914 @ May 31 2020, 11:32 PM) *

Yes we have a prototype we've made and we are completing tooling. Plan for an announcement in about 14 days.
Mark

piratenanner.gif Thanks!

Posted by: dr914@autoatlanta.com Jun 1 2020, 08:23 AM

have been making this for years, by far the best way to mount a bass speaker that does not affect the stock appearance or take up any room. Easy to make, and since the bass does not need to be exposed, an be covered

Posted by: FlacaProductions Jun 1 2020, 08:59 AM

That's great George, but from what I can find, it's only available on your site as a kit with amp, etc. I don't need all that - just the blank board.....

Posted by: mbseto Jun 1 2020, 09:09 AM

You could probably design that to double as a foot rest, put the speaker on the side?

Posted by: FlacaProductions Jun 1 2020, 09:20 AM

Stock appearance/stealth is my goal

Posted by: horizontally-opposed Jun 1 2020, 09:21 AM

The board is easy enough to make. I made one by tracing the factory foam pad and then transferring it to a piece of plywood.

But what I learned was, at least for me, any real loss in legroom results in a significantly less enjoyable car to be in for the passenger. What I thought was acceptable was a lot less so while riding in my car.

Posted by: Mikey914 Jun 1 2020, 12:15 PM

Ours will have a larger cavity behind it and will be side vented. This should yeild better quality sound.

Posted by: horizontally-opposed Jun 1 2020, 12:36 PM

QUOTE(Mikey914 @ Jun 1 2020, 11:15 AM) *

Ours will have a larger cavity behind it and will be side vented. This should yeild better quality sound.


beerchug.gif

If you can do it with a stock appearance and minimal or no loss in legroom, you've got a customer lined up right here. Amp is ready with a fifth channel, and I'm holding off on buying a subwoofer until I see your setup.

Thank you for doing this!

Posted by: Mikey914 Jun 1 2020, 12:39 PM

That's exactly what we are shooting for. Just been a bit busy with the fiberglass today.

Posted by: RoadGlue Jun 1 2020, 01:01 PM

QUOTE(Mikey914 @ Jun 1 2020, 11:15 AM) *

Ours will have a larger cavity behind it and will be side vented. This should yeild better quality sound.


Just a few notes from an audio geek -

Vented enclosures are a tuned system, meaning the port size is very much dependent on the driver's specifications and internal volume of the enclosure. The advantage of a vented enclosure over a sealed box is only power efficiency and SPL. The trade-off is that vented enclosures are typically a lot larger than than sealed boxes, and that the boosted frequencies from the port are usually a pretty narrow frequency range.

If you vent the enclosure but it's not done in accordance to the driver's specifications you'll end up screwing the pooch. You'll get peaks at a higher frequency that the sub isn't able to play - for example it might actually be quieter than a sealed box at normal sub frequencies and then have a big peak of volume at 300 hz which it isn't playing anyway. Since a ported box is open, the sub also requires that all of its suspension comes from it's spider and voice coil, and if it's not tuned correctly you can over drive it more easily than you could with a sealed box which, in a way, keeps the driver under better control.

My advice would be to make the largest sealed box you can throw at this project using a subwoofer that works great in smaller, sealed enclosures, and mate it with a high powered class D amp. The class D amps are so small they easily fit under the dash.

If you must go ported, you need to model it using any number of free software apps to make sure it's all makes sense. Again, I'm not sure if you're planning on offering this with a woofer, which would be the only way a tuned, vented box would work. If you're not offering the box with the sub, then it really has to be a sealed enclosure.

Sorry if this is all stuff you already knew.

Cheers!

Posted by: horizontally-opposed Jun 1 2020, 03:24 PM

QUOTE(RoadGlue @ Jun 1 2020, 12:01 PM) *

QUOTE(Mikey914 @ Jun 1 2020, 11:15 AM) *

Ours will have a larger cavity behind it and will be side vented. This should yeild better quality sound.


Just a few notes from an audio geek -

Vented enclosures are a tuned system, meaning the port size is very much dependent on the driver's specifications and internal volume of the enclosure. The advantage of a vented enclosure over a sealed box is only power efficiency and SPL. The trade-off is that vented enclosures are typically a lot larger than than sealed boxes, and that the boosted frequencies from the port are usually a pretty narrow frequency range.

If you vent the enclosure but it's not done in accordance to the driver's specifications you'll end up screwing the pooch. You'll get peaks at a higher frequency that the sub isn't able to play - for example it might actually be quieter than a sealed box at normal sub frequencies and then have a big peak of volume at 300 hz which it isn't playing anyway. Since a ported box is open, the sub also requires that all of its suspension comes from it's spider and voice coil, and if it's not tuned correctly you can over drive it more easily than you could with a sealed box which, in a way, keeps the driver under better control.

My advice would be to make the largest sealed box you can throw at this project using a subwoofer that works great in smaller, sealed enclosures, and mate it with a high powered class D amp. The class D amps are so small they easily fit under the dash.

If you must go ported, you need to model it using any number of free software apps to make sure it's all makes sense. Again, I'm not sure if you're planning on offering this with a woofer, which would be the only way a tuned, vented box would work. If you're not offering the box with the sub, then it really has to be a sealed enclosure.

Sorry if this is all stuff you already knew.

Cheers!


Very interesting, and appreciated. Wonder if the solution isn't to have a port with a screw-on lid? Then the owner can experiment?

Running a 5-channel amp by JL, with a Class D mono for a sub (I think...need to go look at the box, as it's been sitting a long while—as better audio in my 914 has been pretty low down the list!).

Posted by: bbrock Jun 1 2020, 07:14 PM

QUOTE(RoadGlue @ Jun 1 2020, 12:01 PM) *

QUOTE(Mikey914 @ Jun 1 2020, 11:15 AM) *

Ours will have a larger cavity behind it and will be side vented. This should yeild better quality sound.


Just a few notes from an audio geek -

Vented enclosures are a tuned system, meaning the port size is very much dependent on the driver's specifications and internal volume of the enclosure. The advantage of a vented enclosure over a sealed box is only power efficiency and SPL. The trade-off is that vented enclosures are typically a lot larger than than sealed boxes, and that the boosted frequencies from the port are usually a pretty narrow frequency range.

If you vent the enclosure but it's not done in accordance to the driver's specifications you'll end up screwing the pooch. You'll get peaks at a higher frequency that the sub isn't able to play - for example it might actually be quieter than a sealed box at normal sub frequencies and then have a big peak of volume at 300 hz which it isn't playing anyway. Since a ported box is open, the sub also requires that all of its suspension comes from it's spider and voice coil, and if it's not tuned correctly you can over drive it more easily than you could with a sealed box which, in a way, keeps the driver under better control.

My advice would be to make the largest sealed box you can throw at this project using a subwoofer that works great in smaller, sealed enclosures, and mate it with a high powered class D amp. The class D amps are so small they easily fit under the dash.

If you must go ported, you need to model it using any number of free software apps to make sure it's all makes sense. Again, I'm not sure if you're planning on offering this with a woofer, which would be the only way a tuned, vented box would work. If you're not offering the box with the sub, then it really has to be a sealed enclosure.

Sorry if this is all stuff you already knew.

Cheers!


agree.gif My preference is for a sealed box. If it is vented, I'll just wind up sealing it myself. I'm looking for the tight punch of a sealed box rather than big boom of ported anyway. Louder is not necessarily better.

FWIW, you can see my sub installed on a foot board a couple pages back. Sounds like shit compared to mounted in a box. Even just running this sub in the cardboard box it shipped in sounds way better than free air on the board. Sure, even on the board it sounds way better than not having a sub at all, but it really needs a proper enclosure to get the best sound. For keeping foot space, I'm planning to bottom mount my sub under the face and install an expanded metal grate over it to protect the cone from feet.

Also, my Class D amp fits nicely inside the center console for a completely stealth install.

Posted by: Chris914n6 Jun 1 2020, 10:12 PM

QUOTE(Mikey914 @ Jun 1 2020, 11:15 AM) *

Ours will have a larger cavity behind it and will be side vented. This should yeild better quality sound.

Not enough airspace to be vented.

Posted by: Mikey914 Jun 2 2020, 02:19 AM

Easier to sell un-vented.


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