what box size for 12 sub?

Using the Wedge 2 volume calculator I have .939 cubic feet internal volume available.

Exactly what subs are you using?UNLABELED Custom Car Club President

Oh yea. Rockford Fosgate makes a shallow mount sub and it looks like it wants 1.00 cubic feet in a sealed enclousure or 1.25 in a ported box. Kicker's shallow mount also wants 1.00 cu ft in a sealed but 1.75 in a ported.UNLABELED Custom Car Club President

Haha., Its never 'safe' to assume anything with car audio. Polly fill will add 10-15% of the volume. You should be ok.. Just look up all the specs for the sub BEFORE you buy it and make sure that it will be ok in a 1.00 cubic foot sealed boxUNLABELED Custom Car Club President

I measured again and I can increase my depth 2 inches to 17.  If I figure poly fill adding 15% to the volume that brings it up tio 1.24 cubic feet.

Dont forget that the sub isn't flush with the rest of the box.UNLABELED Custom Car Club President

kaztheminotaur wrote: Is there a list anywhere that gives ideal box volume for 12" and 10" subwoofers? I have a 99 Silverado extended cab and I'd like to make a box to go under the rear seat on the driver's side. Thanks, Tom

Your best bet would be to remove all things under the seat (that don't belong there) See how much room you have, measure it up and throw that in to a box volume calculator. this is the one i used for my boxthat will give you the length width depth and height and factor in material displacement. Simplify that, measure your space, go to that site plug in the numbers and see what you get, if your trying for 1.00 cubic feet and end up with anything under .8xx poly fill wont save you for sealed. I recommend making a box that will stick out slightly in front and behind the seat, ever so slightly so no one will be tempted to use it as a foot stand. After you've measured everything up tweak it with that tool to find out how close you can get and measure it up again with those numbers to make certain it will fit in the space. "I made my box as close to 2.5Cubic feet as possible but didn't remeasure my trunk space and was about half an inch to high....." Measure twice, hate yourself once.