Car Audio Subwoofer-Custom Installation - Router Forums
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post #1 of 18 (permalink) Old 05-25-2019, 11:36 AM Thread Starter
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Default Car Audio Subwoofer-Custom Installation

Hey All;

Since I have actually been getting a little dusty with MDF the last week or two, I thought I would share some of the wood portions of the car restoration project I've been immersed in.

Essentially, I am resto modding a convertible 1987 Mustang with a full race suspension, a 525hp carbureted small block and a pile of modifications, including a monster sound system.

It's a street car/cruiser that will also see the race track and drag strip, as well as the cars and coffee meets and some local car shows once completed.


I was involved in various positions within the car audio industry from the early 80s until the late 90s, basically the peak of this very popular car after market category. Since last summer, I have had a resurgence in interest and have bought up a pile of old equipment and performed a few decent installations in some friends cars and one tricked out Harley.

My car is losing the rear seat, which will be turned into a parcel/storage shelf with a pair of 15" Dr. Crankenstein subwoofers, and something for midbass in the side panels. Working with 30 year old plastic that was ****ty to begin with will be a separate adventure in fibreglassing or chemical bonding, please stay tuned.

My plan here is to build something that follows the interior curves and body lines as well as looks like something that may have been installed at the factory as an option. Plain, with appropriate materials, shapes and access. The car has a 12 pt roll bar in it, so that is both a pain and a boon as you will see.

Decided to build an enclosure that bolts into the re-enforced areas of the chassis ( lots of extra metal has been welded into the car for chassis stiffness and suspension attachment point strengthening). Two main panels are the front and rear, from which all the other measurements and reference points will be taken. Lots of initial cardboard templates. Stripped one of the side panels all apart to get just the basic plastic frame in place. Then contour cut the bottom out, to allow the panel to come in and out, independent of the roll bar and the sub cabinet, once that is permanently installed. Also made up a set of hybrid bolt/studs that thread into the seatbelt anchor points and offer a stud for the panels to attach.

Will be Dynamatting and Dynalinering the areas under the panels, then continue the design for the bracing and dual panel baffles, as well as the trim and beauty panels. All told, this will likely have well over 100 hours in it by the time everything is finished, wired and leather/vinyl and carpet wrapped. The panels have been in and out of the car at least 100 times already, but it's getting there.
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post #2 of 18 (permalink) Old 05-25-2019, 11:39 AM Thread Starter
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And the front panel construction; this is as far as I got. Hopefully get some more done over the weekend, after it stops pouring rain here.
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post #3 of 18 (permalink) Old 05-25-2019, 11:41 AM
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Love to see someone else using cardboard as templates! It's amazing what you can mock up with cardboard, hot glue and duct tape
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post #4 of 18 (permalink) Old 05-25-2019, 11:56 AM
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nice detail work...
why not use a coupling nut, nutsert, E-Z Lok or a coil instead of welding two bolts together..
https://www.ezlok.com/threaded-inserts-for-metal

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

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post #5 of 18 (permalink) Old 05-25-2019, 12:03 PM
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I like to use cardboard to tape together to give me an idea of what my project would look like finished, before I start using up wood.

Nice work. But as soon as I saw it I was immediately reminded of the guys at stoplights with their sound cranked up so loud, even several cars away, and their windows up, that I can't hear my own radio.
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post #6 of 18 (permalink) Old 05-25-2019, 06:47 PM Thread Starter
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Quote:
Originally Posted by Stick486 View Post
nice detail work...
why not use a coupling nut, nutsert, E-Z Lok or a coil instead of welding two bolts together..
https://www.ezlok.com/threaded-inserts-for-metal
Because the seat belt anchors are already threaded 7/16-20 and I have dozens of seat belt bolts and a mig welder. The other end is now 1/2-13 which is way more common, and I have all the appropriate nuts and washers etc. Also, metal insert are not very strong, we use them at work on light fixtures and they fail way too easily in my experience. Usually I weld Gr 8 bolts in to use as studs, or I cut Gr8 threaded rod to size, but these things are a goofy size.

This took less time to make than driving to the hardware store......plus I like using my welder whenever I can lol.

If you look closely at the upper bolts and some of the engine pictures, my fasteners of choice are polished ARP 12 pt stainless steel fasteners that exceed Gr 8 status. I believe there are a couple of hundred in the engine and throughout the whole car.

2019 ARP Catalog


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post #7 of 18 (permalink) Old 06-02-2019, 09:29 AM Thread Starter
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Some progress in terms of design and rough in/mock up after spending the week in Austin and San Antonio. Made a mistake in the layout/measuring of the angle of the back board support, so had to cut a new angle (twice!) to get the baffle to sit just right. These boards have been in and out of the car at least 100x. Would be even less fun, if it wasn't a convertible.

Caught a masked culprit that resembled the Hamburgler in the garage after locking up for the night. Heard noises, then the door started banging and moving........then a little paw stuck out from between the frame and the door. Handsome young fella......and apparently not in too much of hurry to get outta there, lol. No damage, and hopefully he doesn't like Judas Priest or Black Sabbath which will be blaring from the audio system in the back from now on.

Got to use my 30 year old B+D plunge router and a modified MilesCraft circle template to cut the two 14-5/8" dia holes into the 1" MDF. Quite the duststorm, even outside with the shop vac going with a hood. Motivation to connect the Dust collector and make an outdoor hose available asap lol.

The Dynamat and Dynaliner are starting to go in; as the 3 main boards take shape and become the correct size, the rest of the assembly and parts fitment begins to make itself apparent.

Originally was going to try to wrap the boards in material before assembly, but I'm rethinking that plan, along with making a second layer of trim panels that will wrap against the inner quarter panels and old seat back frame. Blind fastening is going to be the desired method. Stay tuned.

The centre spine/support on the speaker baffle and two outside cabinet ends (all yet to be built) will be glued and screwed to the baffle and bolted into the floor via some brackets (also yet to be built) and welded to the floor pan and suspension pickup points.

The OEM carpet is getting the factory backing removed, pressure washed and then laid on top of the fully Dynamatted floor and 1/2 thick Dynaliner, which will also be used throughout the rest of the rear seat floor and old seat frame as well as inside the speaker cabinet.
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post #8 of 18 (permalink) Old 06-02-2019, 01:59 PM
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Itís coning along Paul , looking good . Subwoofers abs car audio used to be my favourite subject .
Unfortunately I got tinnitus from a visit to our local theatre . I have never subjected myself to that many dB before in my life .
The tinnitus increases the worst when I go into an enclosed vehicle , so car audio is out .
I sure miss it though , as you bring back memories of the days when I was fabricating my own systems .
The best compliments I ever received were people telling me that it was factory , and thereís no way I built that lol .
I guess Iíll use my linear actuators for a computer desk or something.
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post #9 of 18 (permalink) Old 06-04-2019, 08:59 AM Thread Starter
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Quote:
Originally Posted by RainMan 2.0 View Post
Itís coning along Paul , looking good . Subwoofers abs car audio used to be my favourite subject .
Unfortunately I got tinnitus from a visit to our local theatre . I have never subjected myself to that many dB before in my life .
The tinnitus increases the worst when I go into an enclosed vehicle , so car audio is out .
I sure miss it though , as you bring back memories of the days when I was fabricating my own systems .
The best compliments I ever received were people telling me that it was factory , and thereís no way I built that lol .
I guess Iíll use my linear actuators for a computer desk or something.
Thx and sorry to hear about your scenario.

If you used linear actuators, then you are ok in my books. I screwed around with pneumatic powered drawers and slides when everyone else was doing the electrics. Lots of fun and frustration getting this all to work smoothly and quietly.

What actuators do you have - presumably 12V 6" or longer stroke?

Once I get into the trunk build I may end up motorizing some of the panels/reveals/storage compartments.

Bracket made up and welded into position. The Threaded portion of the 1/2" bolt will have a nut on the top and bottom, along with lockwashers to keep the baffle inert and supported in both directions. The outer enclosure ends will be attached in a similar manner.

And yes, the bolt was positioned thru the bracket, then welded onto a nut and large washer below to stiffen the mounting plate.....and because I didn't have the correct length bolt in hand, duh!! Looks bubble gummy but most of the mass is the nut and washer, so it's not entirely a Ray Charles weld up scenario. Only blew one hole thru the 18g floor pan too, so I'm getting better at this. Mount is way stronger than the floor now, so it should serve it's purpose. If it was all visible, I would grind and dress the welds, these are straight from the gun, cleaned up with wire brush before primered. Moving ahead.....slowly.
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Last edited by tulowd; 06-04-2019 at 09:33 AM.
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post #10 of 18 (permalink) Old 07-22-2019, 08:16 AM Thread Starter
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Been a while, had a few little work trips away to MN, MA and NH and also updated the Fox coupe setup I did last year; finally swapped out the little MTX amp for an Orion HCCA225 high current amp running 1 Ohm mono, making 400 watts rms into the 4 ten inch speakers. Sounds awesome and tight, one woofer needs reconing, as it rattles the voice coil or spider. Disconnected and still rocks.

Got both side panels templated and then built out of 1" MDF; also welded in support studs into the floor and made structural L brackets to pull them down into the floor. Everything got Dynamatted and then Dynalinered prior to the second to final mockup fitting.

Screwed up the initial vinyl upholstery job on the back panel, thankfully that turned out to be a blessing. Took 2 hours to remove 250 staples by hand, then had to sand, grind and fill the mess I left behind. Duh!!

Ended up buying a new Harbor Freight wide crown 22 g gage air stapler with super short staples and redesigned the entire upper panel and trim. Figured on using the bolster and material design of the Recaro seats that are going in the front would make sense - from a distance it will look like there is actually a back seat. Will all be covered in Alcantera and Napa leather, stitched to match.

Made a rear trim panel that will be mounted from behind using blind stainless ARP 12 pt bolts into the reverse installed threaded inserts.
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