Kicker’s 43TCWRT82 loaded enclosure puts a thumping 8″ CompRT subwoofer and a second passive sub behind the seat of a truck or in any vehicle that’s low on space. The rugged sealed box was designed specifically for the subwoofer, so you can count on getting maximum performance, no matter what kind of tunes you enjoy. The second sub (called a “passive radiator”) reacts to the air pressure produced by the active sub, creating lots more bass without any port noise.