ESX Q201A 20 cm (8) active subwoofer system 200w. 20 cm (8) active subwoofer system. The very slim QUANTUM Q201A system is equipped with an integrated 20 cm special woofer and a real Class A/B amplifier. The under-seat system has a cast aluminum heat sink with excellent cooling properties, which cools the integrated amplifier perfectly. Ideal for small cars, sports coupes and convertibles, the active woofer can be placed anywhere, be it under or behind the seat or in a storage compartment in the trunk. Integrated Class A/B amplifier. 1 x 100/200 Watt RMS/Max. Subsonic 20 Hz fixed. Bass level remote control. Dimensions 210 x 73 x 290 mm.