SRX4.300 - Memphis 4-Channel 600W RMS Amplifier SRX4.300 - Memphis 4-Channel 600W RMS Amplifier RMS @ 2-Ohms: 75W x 4 RMS @ 4-Ohms: 50W x 4 Total Harmony Distortion: &lt; .1% Dimensions (WxHxD): 12.80"