Professional Power Subwoofer Amplifier DS-501B Class D 500W Subwoofer Amplifier * Class-d high efficiency design with new surface mount technology * Output power: 500W RMS@ 4 ω * Total harmonic distortion: < 1% * Input sensitivity: 160mV * Signal to noise ratio: > 100dB * Frequency response: 25Hz 160Hz * Variable low-pass crossover: 50Hz 160Hz (12dB/OCT) * Built-in hi-pass crossover: 20hz (12db/oct) * Built-in bass booster: +5dB @ 40Hz * Built-in phase 0° /180° switch * Built-inLFE/SUB switch * Built-in auto power switch: ON/AUTO/OFF *Protect: cliplimit, DC, short circuit, over current, overheat *Operating voltage:115vac/230vac switchable * Dimension (W xH x L): 215 x 285 x 100 mm