space

Ok, I measured my trunk and figured out I'd be able to construct and enclosure with 7-8 ft^3 of airspace. I'm trying to get loud with an spl application. My question is would I be able to get away with 2 15s or a 18 or should I just stick with 2 12s?

Hello all, I'm just now getting back into car audio and need some assistance in finding my ideal sub... Requirements: 1- 15" sub (1 only) 2- respectable SPL from sealed fiberglass box. 3- performs well with minimal airspace. (maybe 3ft^3?) 4- handle anything below 2500 watt RMS. (closer to...