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I am planning on getting two 12" or two 15" subs soon. In an enclosure built into my trunk floor will 15" even work? I looked at the DIY on it but how do you connect the mdf trunk floor to thebox to make it airtight? Also how do you cut a perfect 12" round hole? If u have done this will u please post a pic of it installed.

 
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yes a 15 wll fit, some 15's have a low mounting depth.

even for large mounting depth 15's, you jsut have to rasie the floor higher.

I propose an addition to the DIY, check THIS one out:

cut a piece of .75 inch mdf the contour of your floor, and glue it in place, airtight. there will be two of these, one in front, by the rear seats, the other in back, by the trunk latch. these will be teh front and back of yrou box.

then you take a big MDF squarethat sits in teh middle of the trunk floor, covering the hole and going up to just where the MDF is in front and back.this will be yoru box top. your trunk at this point should look ugly and gutted, with a ghetto piece of wood in it.

thats what you cut yrou 15" hole in. if yoru 15 is too deep, you make a frame around the mdf square, using 1x2's, 1x3's, 2x4's whatever you need. of course you glue and screw them in and seal the whole thing with silicone.

when you cut out your 15" hole, you cna do it with a rotozip, a jigsaw, a router, whatever you want. I find that the fastest way to get a clean hole is a jigsaw, at a glance its perfect, and maybe not PERFECT, but the real secret to caraudio is, like building a house, its ugly where you cant see it!

so now you have a baffle (piece of wood with a subwoofer screwed to it) that you can set in teh trunk. now you set that in and silicone it in place. you cna screw it in too, if you want. itll be a pain to remove, but youll have taken advantage of all that air, and space, as opposed to make a small *** ghetto MDF box big enough for a single 10 with a .707 alignment, as opposed to plenty of space for a 15". you have already covered the box in carpet or paint at this time, too.

now you add (or you added before covering) a 2x2 frame around the baffle. and cover teh whole floor of the trunk with a board. center will be grill cloth.

so this lets you take advantage of all that space, lets you throw crap in yoru trunk since the subwoofer isnt directly exposed, looks good, is showy when you lift up the grillcloth, you spent no time making perfect the junk you DONT see, (like that hole) and it jsut has a cleaner look in general.

if you use 2x3's instead of 2x2's then you can sink yoru amps under there around the box, and youll never see them after the floor is put in. just makes it cleaner.

ofr you cna put them INSIDE the frame, sowhen you lift up teh grill, you see THAT.

as to teh DIY itself, imagine a regular box where the top part that the subwoofer is attatched to exteds out in the shape of yoru floor. thats how it works, the top isnt removeable from the mdf bottom, its PART of it!

but yeah, to end this book i wrote that should have teken 2 seconds, following the DIY by steps wont giv eyou the space nor air for a 15". but you can always modify their directions

 
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ill try to get the false floor pics up asap

needa getem first

 
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I'd love to those too!

 
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I forgot who had it but one guy made a box in the trunk and had the speaker and the amps sunk in and then had an MDF peice that fit the floor, but had had it so that he could cover the speaker and the amps with the cut sections. Then he carpeted them as well so it matched the floor and you could still use it as a trunk.

 
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punking, you just described exactly what i layed out, step by step, to build up there ^^^^^^

you want that in yrou car? the general directions are 4 posts up!