MOTO 600.4 - Arc Audio 4-Channel 600W RMS Ultra Compace Class D Amplifier 4-Channels at 4-Ohms: 150W | 4-Channels at 2-Ohms: 150W | 2-Channels at 4-Ohms: 300W Frequency Response: 20Hz - 20kHz | Total Harmonic Distortion: 0.02% THD | Bass Boost: 12dB at 45Hz Fuse Rating: 30A x 2 Internal | Dimensions: 8.25" L x 5" W x 1.75" H | Compatible with all 2 and 4-Ohm Systems Ultra Compact Design Fits inside Most Fairings | Remote Status Display Light Included | Weather Resistant Chasses Design High Frequency Switching Power Supply Delivers more power without compromising sound quality Audiophile Class D output filter networks