DS18 Ultra Compact Class-D Monoblock Amplifier, 300W RMS/900W MAX 300 x 1 RMS @ 1 Ohm 220 x 1 RMS @ 2 Ohms 140 x 1 RMS @ 4 Ohms DIM (W x H x L) 3.24" x 1.37" x 5.54" Class-D Recommended Fuse Size: 30A Remote Level Control 1 Ohm Stable RCA Inputs THD: 0.2% Low Pass Crossover: 50Hz - 240Hz Frequency Response: 20 Hz - 500 Hz Signal to Noise Ratio: 90dB Bass Boost: 0 - 18dB @ 40 Hz Subsonic Filter: 10 Hz - 55 Hz Phase Control Protection: Thermal, Over-Load, DC Output, Short & Voltage