Wharfedale SW15

The Wharfedale SW-15 is a 15-inch active subwoofer system with a 400-watt amplifier and a frequency response of 30–120Hz. It has a peak power output of 850W, a crossover range of 30–150Hz, and a signal-to-noise ratio (S/N) of ≥85dB. The SW-15 also features:
Stereo line in (2 x RCA phono)
Mono (LFE) line in (RCA phono)
Line input sensitivity of 200mv for maximum output
Phase inversion
Auto on-off
Copper lined vents on the center voice coil
Rear-firing ports for enhanced bass extension