Kicker 48TCWRT102-3 Truck-style sealed enclosure with single 10" CompRT® 2-ohm subwoofer and passive radiatorEnlarge your horizons with bigger bass Kicker's CWRT102 loaded enclosure puts a low profile 10" CompRT subwoofer and a second passive sub in a compact box that brings Kicker bass power to the crowded spaces of today's cars and trucks. The rugged sealed box was designed specifically for this subwoofer, so you can count on getting maximum performance whatever music you listen to. The second sub (called a "passive radiator") reacts to the air pressure