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Sony XM-604M Marine Amplifier features 60W x 4 RMS at 4 ohms (4-channel); 60W x 2 plus 240W x 1 at 4 ohms (3-channel). 80Hz low/high pass filter. Sony XM-604M includes RCA and speaker level inputs. 15-7/8"W x 2-1/4"H x 10-3/8"D.