sub box build
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
sub box build
hey all,
i followed the instructions available in one of the stickys here for building a rear well box, and it took me most of the afternoon but it is done in a dry fit stage. i still need to test fit it in the car, trim the side pieces, and then re assemble it with glue and add the top panel to actually house the subs.
the instructions were very good, save one part, where there is an incorrect angle. I noticed just before i began to put the pieces together, but there was plenty of extra from the 4x8 sheet of mdf so i rebuilt it properly.
here are some pics



i followed the instructions available in one of the stickys here for building a rear well box, and it took me most of the afternoon but it is done in a dry fit stage. i still need to test fit it in the car, trim the side pieces, and then re assemble it with glue and add the top panel to actually house the subs.
the instructions were very good, save one part, where there is an incorrect angle. I noticed just before i began to put the pieces together, but there was plenty of extra from the 4x8 sheet of mdf so i rebuilt it properly.
here are some pics



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From: Mount Pleasant Michigan
Car: 87 Camaro IROC, 85 IROC Roadste
Engine: 5.7 V8 350 TPI, 383 - Coming Soon
Transmission: 700R4, Turbo 350
Axle/Gears: 3.27
Re: sub box build
Looks good. Just need to finish the cutting a lil bit and it should fit pretty good.
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: sub box build
test fit today and everthing looks good, i will be cutting the top soon, but first i am going to reassemble with the liquid nails and caulk the interior seams.
i will put up pics later, i got out the air sander and rounded all the sharp edges a bit as well as the one lip that slides under the hatch latch. the box slipped right in for me, no shimmying, no fighting, no force necessary. and it didnt budge once it was down there. I am really pleased with the way it turned out.
i will put up pics later, i got out the air sander and rounded all the sharp edges a bit as well as the one lip that slides under the hatch latch. the box slipped right in for me, no shimmying, no fighting, no force necessary. and it didnt budge once it was down there. I am really pleased with the way it turned out.
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: sub box build
https://www.thirdgen.org/forums/car-...ize-check.html
i believe it is somewhere in that thread otherwise try searching for it
i believe it is somewhere in that thread otherwise try searching for it
Thread Starter
Member
iTrader: (5)
Joined: May 2009
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: sub box build
all glued and caulked now- i will be getting my actual sound hardware in the next few weeks so i will put up pics of the rest of the work on the top sheet and wiring when i get the subs.
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: sub box build
2 12" Pioneer 800W
and an SLP 1440W amp is what im buying off a friend with wires for 300 bucks
figured id help him out and they still hit real hard so whatever as long as they work
and an SLP 1440W amp is what im buying off a friend with wires for 300 bucks
figured id help him out and they still hit real hard so whatever as long as they work
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iTrader: (5)
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Senior Member
Joined: Oct 2007
Posts: 585
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From: Stone Mtn., GA
Car: 90 Camaro RS
Engine: V6 3.1 MFI
Transmission: 4 Speed Auto 700R4
Axle/Gears: 3.23
Thread Starter
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iTrader: (5)
Joined: May 2009
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: sub box build
there are two parallel pieces on either side and one perpendicular piece on either side that are the sides of the inward cuts and what the large angled piece that rests against the forward part of the well- the way the instructions make it has the two in-line pieces at a perfect angle, except they have a 3/4 piece perpendicular between them that doesnt match the angle. I threw out the pieces as soon as i saw that it was geometrically impossible to make them flush, and started over. I didnt write down anything, i just cut from the hip on the table saw after making some overall dimensions and then used a jig to maintain the angle.
As long as you cut one piece at a time and assemble as you go it should be fairly obvious to you.
good luck!
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: sub box build
i get my subs and amp tomorrow 
i'll finally get to wrapping up the top piece and wiring some terminals in. pics to follow when its done.

i'll finally get to wrapping up the top piece and wiring some terminals in. pics to follow when its done.
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: sub box build
the guy im buying my hardware off of wouldnt wake up when i was at his house today- so i didnt get my stuff 
he works night shift so its not like he was just being an *** but whatever. i will get them eventually!

he works night shift so its not like he was just being an *** but whatever. i will get them eventually!
Thread Starter
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iTrader: (5)
Joined: May 2009
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: sub box build
alright i picked up my subs amp and wires this past weekend. i have yet to cut out the top piece for my box, but from the looks of the subs im going to need a baffle to raise them up another 3/4" because they are really deep.
Last edited by kthxbai; Sep 4, 2009 at 12:28 PM.
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From: Schenectady, NY
Car: 92 RS 98 SS 92 TY 09 CTS4 03 Yukon
Engine: L03 soon to be LQ4
Transmission: 700R4 soon to be 4L60E
Re: sub box build
My question is where do I put the t tops in the car now that I have speakers and amps back there?
I'm going to have to build something special for them.
I'm going to have to build something special for them.
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Joined: May 2009
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: sub box build
i have my baffles made and ready, and the top sheet i cut out from a cardboard template i made is really close to fitting properly. The big issue now is that the box itself sits right against the back of the well, and i need the top sheet to reach it so i can screw it down etc. but the top sheet does not fit perfectly enough yet for it to be a good fit with the back of the box. I just made my second revision to the top and will hopefully be finished soon.
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: sub box build



finally done!
gonna wire it in later on this week hopefully, and got a new head unit too
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Joined: Oct 2007
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From: Stone Mtn., GA
Car: 90 Camaro RS
Engine: V6 3.1 MFI
Transmission: 4 Speed Auto 700R4
Axle/Gears: 3.23
Re: sub box build
Nice, when I was looking at the direction I was totally lost with the top cause you have to kinda wing it.
I finished my box but it's not this one, my friend end up talk me into building one that sits up angled towards the driver, much like the ones on ebay.
Is your box split into two separate chambers?
Also I will recommended anyone reading this not to buy a Amp wiring kit off Amazon.com if they can't ship in with in two days. Mine gave me a 12 day till ship (that was fine cause I had not finished the box) and now I'm look at not getting it till late October (not fine at all).
I finished my box but it's not this one, my friend end up talk me into building one that sits up angled towards the driver, much like the ones on ebay.
Is your box split into two separate chambers?
Also I will recommended anyone reading this not to buy a Amp wiring kit off Amazon.com if they can't ship in with in two days. Mine gave me a 12 day till ship (that was fine cause I had not finished the box) and now I'm look at not getting it till late October (not fine at all).
Thread Starter
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iTrader: (5)
Joined: May 2009
Posts: 496
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: sub box build
that sucks!
i bought the hardware off a friend who actually included all the wiring for the amp so im set there. good luck getting your setup running
and no my box isnt seperated
i bought the hardware off a friend who actually included all the wiring for the amp so im set there. good luck getting your setup running
and no my box isnt seperated
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From: SAN FRANCISCO
Car: 87 GTA
Engine: L98 5.7 24#inj,World hds,MSD,nosmog
Transmission: 700R4 truck clutches,Trans go shift
Axle/Gears: 10 bolt chevy 3.73 limited slip
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From: Peoria, IL
Car: 1988 Camaro Sport Coupe
Engine: 5.0 305 Carb'd
Transmission: 700R4
Axle/Gears: 3.23
Re: sub box build
i like everything. but the difference in the color just bugs the hell out of me. i would take the rest of the carpet that goes in the hump and pull it out and use it as the top of the sub box that way it all blends in and it looks like the subs are mounted straight into the floor.
Thread Starter
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From: Washington D.C.
Car: 1985 Z28
Engine: LT1
Transmission: T56
Axle/Gears: fourth gen 3.42
Re: sub box build
i have black seats, trim, etc. so i figured i dont really care. it was going to be annoying to match the gray perfectly for the box so i went the simplest route of just black. sorry it bugs you :P
i havent fired them up yet i need a fuse and im going to get 14 gauge speaker wire cause the 16 on there now is trash.
i will probably need a capacitor for this in the end but i dont want to pay for one lol
its 1440W to two 800W peak dvc 12" pioneers. that draws a max of 120A, and i have a stock lt1 alt. rated at 140A, and a new battery. we will see...
i havent fired them up yet i need a fuse and im going to get 14 gauge speaker wire cause the 16 on there now is trash.
i will probably need a capacitor for this in the end but i dont want to pay for one lol
its 1440W to two 800W peak dvc 12" pioneers. that draws a max of 120A, and i have a stock lt1 alt. rated at 140A, and a new battery. we will see...
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Joined: Oct 2007
Posts: 585
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From: Stone Mtn., GA
Car: 90 Camaro RS
Engine: V6 3.1 MFI
Transmission: 4 Speed Auto 700R4
Axle/Gears: 3.23
Re: sub box build
Yea, Here you go, click and save.
https://www.thirdgen.org/forums/atta...ox-sub-box.pdf
https://www.thirdgen.org/forums/atta...ox-sub-box.pdf
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