Dayton Audio SPA500DSP 500W Subwoofer Plate Amplifier with DSP Dayton Audio's SPA500DSP true 500 watt digital switching plate amplifier features advanced signal processing control that every audio enthusiast wants. This power and flexibility is accessible via PC-GUI software and our innovative single-knob LCD control panel. For retrofit and enclosure designs with no amplifier cutout an optional amplifier mounting frame is available for this amplifier. Specifications: • Power output: 500 watts RMS into 4 ohms, THD+N <0.1% • Signal to noise ratio: 97.9 dB (A-weighted) • Input sensitivity (RCA): 320 mV - 1.4 V • Input sensitivity (XLR): 630 mV - 2.7 V • Power requirements: 110~120/220~240 VAC selectable, 50/60 Hz • Amplifier dimensions: 10.25" H x 7.25" W x 2.125" D; Amplifier cutout: 9.25" H x 6.25" W.