Cadence Acoustics ZRS C9 600 Watt Peak 16V 4-Channel Class AB Amplifier ZRS Type C9 4-Channel ZRS Series Class A/B Full Range Competition Car Amplifier RMS Power Rating: 4 ohms: 100 watts x 4 chan. / 2 ohms: 150 watts x 4 chan. Bridged, 4 ohms: 300 watts x 2 chan. Max power output: 1200 W Minimum THD: &lt; 0.01% Cadence ZRS C9 class AB 4-channel amplifier 100W x 4 @ 4 ohm RMS, 150W x 4 @ 2 ohm, 300W x 2 @ 4 ohm bridged RMS, 600W Peak Power Frequency Response: 10Hz - 40 kHz Minimum THD: 100dB; Damping Factor: &gt;640 @ 100Hz; Channel Separation: &gt;65dB Dimensions (L x W x H): 15 x 11.6 x 2.7 inches