Sub Woofer Installation, Tried to get better Audio without carving up the car Options

[r_towle]

Seems to be some great Knowledge here, so I’m hoping I can learn something.

I am planning to build a box, or two separate boxes, to place two 8 inch subwoofers behind the front seats, on the floor of my 1984 911.
I have seen an older fiberglass box that is no longer produced, and a few other pictures.

This is for subs.
8 inch pair
One behind each seat
Separate amp for the subs

1) does a sub box need to be ported for air to escape?
2) size of enclosure for 8 inch? What if it’s too small?
3) same amp fir two subs?
4) same box fir two subs, or separate?
I have another amp that powers both door speakers, both tweeters, and rear speakers
I currently have a single 12 in sub in the front trunk I want to remove so I actually use the front trunk.

Advice?

[Chris914n6]

Watch youtube. This guy in particular. CarAudioFabrication

Too much to try to explain here.

Seems to be some great Knowledge here, so I’m hoping I can learn something.

I am planning to build a box, or two separate boxes, to place two 8 inch subwoofers behind the front seats, on the floor of my 1984 911.
I have seen an older fiberglass box that is no longer produced, and a few other pictures.

This is for subs.
8 inch pair
One behind each seat
Separate amp for the subs

1) does a sub box need to be ported for air to escape?
2) size of enclosure for 8 inch? What if it’s too small?
3) same amp fir two subs?
4) same box fir two subs, or separate?
I have another amp that powers both door speakers, both tweeters, and rear speakers
I currently have a single 12 in sub in the front trunk I want to remove so I actually use the front trunk.

Advice?

[bbrock]

@Mikey914 any progress on the subwoofer boxes?

[FlacaProductions]

(IMG:style_emoticons/default/agree.gif)
Brent - I did "your" stereo install - same amp and location/method as well as some new Alpine 6-1/2's replacing the older Blau's. Sounds good but holding off on a sub even tho I have George's pre-cut panel ready to go. I'm thinking a sealed box would be best....

[bbrock]

(IMG:style_emoticons/default/agree.gif)
Brent - I did "your" stereo install - same amp and location/method as well as some new Alpine 6-1/2's replacing the older Blau's. Sounds good but holding off on a sub even tho I have George's pre-cut panel ready to go. I'm thinking a sealed box would be best....

Good plan. I made a panel to mount the sub in as a temporary measure. To be honest, I think the bass is worse with that setup than if I had no sub at all. I'm going to see if I can figure out a way to make the panel seal tightly against the bulkhead to form a sealed compartment. If that doesn't work, I may just disconnect my sub until a 914R box is available or I have time and $ to make one myself. To do it right will require making a mold so I'd need to make enough to sell a few to recoup costs. Doesn't make much sense to do that with a 914R unit in the works. I need to do something though. I need my tunes! (IMG:style_emoticons/default/tunez.gif)

[mb911]

Couldn't a small sub box be made to fit where the foam kick panel is in the passenger foot well?

[FlacaProductions]

Yup - that's exactly what we're talking about....it just needs to be made!

[bbrock]

Yup - that's exactly what we're talking about....it just needs to be made!

They have been about "six weeks out" for over two years now. (IMG:style_emoticons/default/sad.gif)

[Mikey914]

@Mikey914 any progress on the subwoofer boxes?

Honestly I had been pushing forward an the door panels, the dash tops the side front pillars and the exhaust. The resins cost has spiked and is actually starting to stabilize. I have the fiberglass bumper top in front of them and they are about to be released.
Mark

[FlacaProductions]

Thanks Mark - we know you're busy and always bringing something new to the market - just keeping this in line! (IMG:style_emoticons/default/aktion035.gif)

[bbrock]

Thanks Mark - we know you're busy and always bringing something new to the market - just keeping this in line! (IMG:style_emoticons/default/aktion035.gif)

(IMG:style_emoticons/default/agree.gif) Thanks for the update Mark. We do appreciate the furious pace you've been developing products at.

And just as a reminder, I believe most of us waiting on these agreed that unported boxes would be best and easier to produce. Since ideal port size varies by speaker, probably best to leave that for the customers to modify as needed.

[mb911]

Let's just all do high quality wood ones. If nothing else I could do them . Let me know

[bbrock]

Let's just all do high quality wood ones. If nothing else I could do them . Let me know

The challenge is that the foot well space has a very complicated contour. You need to use pretty much all of that space to get enough volume for a decent sub enclosure so it doesn't lend itself to wood. I'm a woodworker myself and have contemplated whether it could be done. The only way I come up with is to cut a front and end piece that is sealed to the metal bulkhead to create a sealed air volume. If I had a spare footwell foam, I'd lop off the inner end to get a good template for a cut.

[mgp4591]

There's a design in the works to maximize the forward part of the console to fit a sub box with a 6" sub and a labyrinth baffle to have in drop into the 60hz range which should be enough with the cabin gain to provide a good bump. Possibly even 2 6s...

[Mikey914]

Actually, it's not that I'm not doing anything here. I have some tooling partially completed, and once I can complete it, it will make these fit well and will make these easy to mass produce. I appreciate the patience.
Mark

[Nexage]

The Kenwood KFC-4675C speakers sound like a solid choice, especially with the built-in midrange and high-range components. Using a passive crossover along with an original Blaupunkt tuner and an '80s power amp sounds like a smart way to maintain the authenticity of a car restoration while maintaining the desired sound quality.

Installing sound deadening materials throughout the vehicle was a smart move to reduce noise and improve the overall driving experience. And I must say, your son’s idea of installing a subwoofer on the center console is quite brilliant! This is a creative solution that preserves the original appearance of the car and gives the audio system additional expressiveness.

I would also recommend that you create personal software for high-quality stereo system setup. The professionals of the https://www.cogniteq.com/ team can help with this; they will do everything in the best possible way.

[ctc911ctc]

Thank you for the nice complement - he is in Engineering school now, we both would like to do a 2.0 version - we learned a great deal......

The Kenwood KFC-4675C speakers sound like a solid choice, especially with the built-in midrange and high-range components. Using a passive crossover along with an original Blaupunkt tuner and an '80s power amp sounds like a smart way to maintain the authenticity of a car restoration while maintaining the desired sound quality.

Installing sound deadening materials throughout the vehicle was a smart move to reduce noise and improve the overall driving experience. And I must say, your son’s idea of installing a subwoofer on the center console is quite brilliant! This is a creative solution that preserves the original appearance of the car and gives the audio system additional expressiveness.

[Freezin 914]

Do the Kenwood KFC 4675C speakers fit factory grills with no mods? Just looking at this….anyone install them recently?

[JmuRiz]

They should, most 4x6 or 4x6 plate speakers fit w/o mods.
I had infinity kappa 4x6 plates (separate 4” and tweeter) worked like a charm.