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Old 07-25-2004, 02:58 PM   #1 (permalink)
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I want to put a sub box in my E36 M3. I only want a 10 inch sub in it, but I have never made a sub box before and wonder if anyone has any tips, designs or templates of any type to share? I plan to seal the interior with silicone and to carpet the exterior to match the trunk. I want it to be very low key, not showy at all. I also want it to be safe from all the crap I usually have flying around in my trunk. It also HAS to be securely mounted as I am lunatic on the road and dont need a box of wood smashing around my trunk.

Thanks to all in advance.

Pete
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Old 07-25-2004, 04:16 PM   #2 (permalink)
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I've become quite adept at building boxes. I'm on my second for my car, and have done a few others

Use 3/4" MDF.

The base should be no wider than 33" or shorter than 32". 16" tall is good. The wider you make it, the more presice it will fit, but it will also be harder to get in position. Don't worry about bolting it down. I've never had to and they've never slid on me.

Use GE Clear Silicon Sealant/Adhesive II.

Former box:



Current Box:



The slope of the backseat is 27 degress.
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Old 07-25-2004, 10:00 PM   #3 (permalink)
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Lol, nice boxes pres, how about this? (15", 5L of xmax displacement) I would use liquid nails instead for bonding, and silicon adheasive\caulk to cover the inside joints to ensure a good air seal.

This beast is so loud, it rattles the frame of the house. I'd be scared to port or even PR this beast...
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Old 07-25-2004, 10:04 PM   #4 (permalink)
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The first box used liquid nails. Over time, it cracks, and I had to go back and reseal with the GE silicon.

I also use 1 1/4" wood screws to hold the box together. The adhesive helps form a tighter seal and hold it in place while drilling pilot holes.
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Old 07-25-2004, 11:50 PM   #5 (permalink)
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how hard is it to use plexy glass in the install like part of the box
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Old 07-26-2004, 01:21 AM   #6 (permalink)
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Don't use plexi unless you have some HARDCORE 1" thick stuff. (or much thicker, depending on the surface ara) Lexan's bad too, It's purpouse is to not break, but it still flexes.
Plexi & lexan flexe a whole bunch, and SIGNIFICANTLY lowers your potential SPL and SQ.
See-through sub boxes are for show, not preformance. If you just had to do it, I'd use what they make aquarium "glass" out of, I want to say it's acrylic... but whatever it is, it's damn think, and dosn't look flexable at all to me. Considering the surface area these huge pieces have, a much smaller piece wouldn't have to be that think.

(aquarium glass, as in - the huge WALLS of "glass" with dolphins and whales in the tanks...)
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Old 07-26-2004, 10:17 AM   #7 (permalink)
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Very true. Stay away form plexi unless all you want to do is show off. I just went to a car show and they had some serious systems there, and non used plexi.

That said, its very easier to work with. you just need a long drillbit.
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