15 x 20 cm (6 x 8) Active Subwoofer System. The new and very slim QUANTUM Q168A system is equipped with a 15 x 20 cm special woofer and a real Class A/B amplifier. It has an aluminum cast heatsink with excellent cooling capabilities, which optimally cools down the integrated amplifier inside. Ideal for small cars, sport coupes and convertibles, the Q168A finds a place anywhere – under or behind the seat or in a storage compartment. 15 x 20 cm (6 x 8) Active Subwoofer System Integrated Class A/B amplifier. 1 x 100 Watts RMS, 1 x 200 Watts Max. Subsonic 20 Hz fixed. Dimensions 210 x 73 x 290 mm.