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> "Invisible" audio for the Porsche 914
horizontally-opposed
post Dec 20 2020, 12:43 AM
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Plans to go for a drive in my 914 this weekend were dashed by yesterday's stay-at-home alert, so I finally dug into a minor project I've been putting off: Rebuilding the car's 28-year-old audio system. While it performed well for 15-20 years, a mixture of age, heat, moisture, etc eventually caught up to it.

System goals: 1) Install a system powerful enough to be enjoyed with the top on or off; 2) maintain/improve "period correct" appearance with no head unit and, if possible, no visible speakers; 3) minimize weight; 4) avoid or minimize additional holes/etc.

I'm going into this with the understanding that it's entirely possible the exercise will be futile with a 2.2-liter flat six, but I have been collecting the parts over time and figure it's worth a shot. Some of this stuff has been sitting for years and thus may not be available anymore—but plenty of alternatives are.

Old system components:
Tape cassette head unit Smartphone flopping around on seat > EQ
Pyle graphic EQ turned on/off by factory rear defrost switch
Pioneer fan-cooled amplifier (~1991)
Boston Acoustics four-speaker set in doors (~1991)
Pioneer ducted bass wedge in passenger footwell

New system components:
Smartphone with a proper mount > EQ
Blaupunkt five-channel parametric EQ
JL five-channel amplifier
JL six-speaker set for factory speaker enclosures and door
?? subwoofer in passenger footwell (prepare for now, add later)

Fair warning: This thread may proceed at a glacial pace, as midlife plus a small business means my days in the garage are fairly rare in this chapter. I'm also figuring this out as I go, and will use this thread as a journal and a place to share ideas.
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horizontally-opposed   "Invisible" audio for the Porsche 914   Dec 20 2020, 12:43 AM
horizontally-opposed   Hmm, not able to upload images. Different browse...   Dec 20 2020, 12:47 AM
Jett   Hmm, not able to upload images for some reason. H...   Dec 20 2020, 09:21 AM
Krieger   Sometime, depending on what I'm attempting to ...   Dec 20 2020, 10:58 AM
horizontally-opposed   I never read the manual, either—but I was curiou...   Dec 20 2020, 11:26 AM
bbrock   But, for now, this thread is…stalled. My signal...   Dec 20 2020, 11:29 AM
horizontally-opposed   The mids & tweeters will easily fit into the f...   Dec 20 2020, 09:43 PM
BillC   The mids & tweeters will easily fit into the ...   Dec 21 2020, 09:15 AM
horizontally-opposed   Hopefully this is just a silly question, but hav...   Dec 21 2020, 03:49 PM
horizontally-opposed   On, to system components. Goals: 1) No head uni...   Dec 20 2020, 09:53 PM
horizontally-opposed   Goals with the amp are to power the six-speaker se...   Dec 20 2020, 09:59 PM
bandjoey   I remembered this stereo setup from some years bac...   Dec 20 2020, 11:37 PM
horizontally-opposed   I remembered this stereo setup from some years ba...   Dec 21 2020, 12:41 AM
IronHillRestorations   I remembered this stereo setup from some years ba...   Jan 11 2021, 10:29 PM
horizontally-opposed   With speaker locations figured out, next up is loc...   Dec 21 2020, 01:08 AM
djway   The last 914 I built was like rolling around insid...   Dec 21 2020, 10:33 PM
djway   Well Christmas delivered me a nice 6 speaker syste...   Dec 26 2020, 02:07 AM
horizontally-opposed   Well Christmas delivered me a nice 6 speaker syst...   Dec 26 2020, 10:52 PM
horizontally-opposed   Not a huge update, but finished the rough cuts of ...   Dec 26 2020, 11:03 PM
horizontally-opposed   In factory enclosure, and with the speakers test f...   Dec 26 2020, 11:07 PM
djway   My understanding of high frequency sound waves gen...   Dec 26 2020, 11:13 PM
horizontally-opposed   My understanding of high frequency sound waves ge...   Dec 26 2020, 11:20 PM
bbrock   My understanding of high frequency sound waves g...   Dec 26 2020, 11:44 PM
horizontally-opposed   BTW, I love that fancy circle cutting jig :) ...   Dec 27 2020, 12:41 PM
trick-e   I’ve a set of enclosed Focal tweeters, with dire...   Dec 27 2020, 01:03 PM
douglastic   I put a hidden system in my 68 bug .. mounted the ...   Dec 27 2020, 03:38 PM
914_7T3   @horizontally-opposed Can you share the spec on ...   Jan 9 2021, 04:24 PM
horizontally-opposed   Can you share the spec on the ABS plastic that y...   Jan 10 2021, 03:31 PM
914_7T3   Can you share the spec on the ABS plastic that ...   Jan 11 2021, 07:44 PM
windforfun   I've done this in many cars. Great work! ...   Jan 10 2021, 04:49 PM
IronHillRestorations   Put some surface mount tweeters on either side on ...   Jan 11 2021, 10:18 PM
horizontally-opposed   Put some surface mount tweeters on either side on...   Jan 11 2021, 11:15 PM
914forme   Also, was surprised to see JL not only recommend...   Jan 13 2021, 11:46 AM
horizontally-opposed   Not surprised at all with out a proper dsp you c...   Jan 14 2021, 09:46 AM
horizontally-opposed   Okay, back to a relatively simple but good enough ...   Jan 11 2021, 11:24 PM
horizontally-opposed   A bit of test fitting. May use rivets for the mids...   Jan 11 2021, 11:28 PM
IronHillRestorations   A bit of test fitting. May use rivets for the mid...   Jan 13 2021, 11:11 AM
horizontally-opposed   With the speaker enclosure plan coming into view, ...   Jan 11 2021, 11:36 PM
Rob-O   Those mids in the adapter plate look way too deep ...   Jan 13 2021, 12:47 PM
horizontally-opposed   Those mids in the adapter plate look way too deep...   Jan 13 2021, 12:53 PM
914forme   :agree: but I had also thought about building a sm...   Jan 13 2021, 01:13 PM
Chris914n6   I had to flip your end result and mount the tweete...   Jan 13 2021, 02:08 PM
horizontally-opposed   I had to flip your end result and mount the tweet...   Jan 14 2021, 09:36 AM


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