Pioneer's compact UD-SW250T subwoofer enclosure will give you great bass in a limited space. At only 4-3/4" deep, it'll fit behind the seats of most pickup trucks or into some dimensionally challenged places in other vehicles.

BB122-125V ported enclosure holds two 12" subwoofers and offers an internal volume of 1.36 cubic feet per chamber. Its large vents feature rounded inner corners that keep port noise to a minimum for more accurate response.

Sound Ordnance designed the B-24 dual bandpass subwoofer to be the bass fortress in your vehicle's sound system. The sturdy enclosure houses a pair of 12" polypropylene woofers in individual airtight sealed chambers, plus a third chamber that features a generous slot port for massive air movement.