Subwoofer power rating 170 watt effective output 220 watt principle active frequency response 28 190 hz noise level 112 db impedance 25 ohm crossover frequency 40 120 hz power supply mains operation colour black cabinet surface ash housing surface veneer vinyl control features volume control adjustable transition frequency switchable phase control speaker enclosure bass reflex bass chassis 305 mm analogue input analogue audio input rca wid