yeah ive got all the stuff amps and wiring kits on my faviroites but i cant find the thread. That one Monkey Biz mentioned is pretty good though. Im trying to woork out if two 12" subs and an amp physically fit when you board over the rear seat.
yes, look here for your calculations
http://www.the12volt...io/boxcalcs.aspinfact you could build a isobaric quasi eigth order series tuned dual reflex bandpass enclosure using 2 dual voice coil 4ohm 8"subs running in series parallel to show a single 4ohm load that wouold blast out a pair of boxed 15"'s let alone a pair of 12's and fit it in the boot and keep the back seats (just think about insurance for removing the back seats)
it may seem cool having 2 big subs at the back of your head but imagine having an awsome box hidden away in the boot........ other people will feel the bass but only see a wee pair of sizes inside until you open the boot lid

, it would blow the clothes of a woman!!!
just remember in the 90's mb quart took the soundoffs by storm with a amazing bass box that was 15"x15"x24", its was a sixth order isobaric design, went down to 20htz and contained 2x 6" mb quart subs
Edited by monkeybiz, 12 October 2009 - 07:14 AM.