I used to have my amp mounted to the backside of my sub box. The box has that el-cheapo carpet stuff that most sub boxes have with very little body to it. It was probably not the best stuff to have the amp sealed up against, but it only ever overheated if I forgot to put the removable parcel shelf in and it was in sunlight. It was only a 400w sub and 350w amp.
Now I have got a partly painted MDF box (that I made a little too cheaply/hastily) with a Kicker 15x15inch L7 sub (2ohm per coil) (fella who I bought it off said it was 5000w, Im guessing because it is a dual voice it is 2500w per coil). I still have the 2ch 350w sony amp powering it...and it overheats. I took the bottom cover off the amp and flipped the amp on it's top so the heat could escape, lasts a bit longer but still cuts out after about 10-15min. At the amp I currently have the 2-core speaker cable with positive wire hooked up to + L and negative wire hooked up to - R (so is hooked up in mono). At the sub I have the positive core of the cable hooked up to coil 1 + terminal, and a wire going from coil 1 + terminal to coil 2's + terminal, and the negative core of the cable hooked up to coil 1 - terminal and a wire going from coil 1 - terminal to coil 2's - terminal. I know there's about 3 or 4 ways to hook up these dual voice subs, just don't know what combination I should use.
Going to mount the amp (with bottom plate removed) on top of a timber frame with a computer fan mounted up beside it to suck air in one side of the frame, under/thru the amp, and up out the fan on the other side. I got a 1000w d-class kenwood amp with the sub, but i'm too much of a tightass to pull out all my 10 gauge wiring and put in new 8 gauge wiring. If the fan thing doesn't work I'll just have to bite the bullet and re-run all the wiring.
The 8mm thick MDF box for the sub has no padding/insulation inside, no floor, and about a 1in x 26in gap in bottom front, 5mm x 26in gap in top front, 12mm x 26in gap top rear, and a 3/4in x 26in gap in bottom rear when on a flat surface (the carpet in the boot has about 1in thick jute insulation under it so the bottom gaps are nearly completely closed up). What would you suggest to do to the box in relation to padding/insulation (go to st vinny's and buy a couple of bedsheets or pillows and chuck 'em in?) and should I put a bottom on it and seal up all the gaps, or leave just one of the gaps? The amp is probably getting pushed pretty hard to get the sub to go hard enough to get enough bass from the crappy box. There's a lot of travel in the sub cone, I think it's just the box.
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good luck
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