one of my 12 inch subs require 1.75 cu. ft. of air space for a ported box, i have 2 12 inch subs so im assuming it requires 3.5 cu. ft. of air space.... my question, is it possible to build a ported truck box that big that will fit behind the seat of my standard cab f150 (99 model).... if so please give me ideas, or even setups if u have big boxxes in your trucks.... the reason im asking this is because i got a small sealed box behind the seat and i can spare plenty more room and i want MOOOORRREE bass thanx

 

Good luck trying to get 3.5 cubic ft of airspace behind your seat! I would build a new sealed box with shared air space ( it will fool your subs into thinking there is more airspace, polyfill also works good for making the subs think there is more space).