JBL, Multi-Element High-Performance, 5-Channel Amplifier 5-Channel Marine Amplifier — 45 Watts RMS X 4 At 4 Ohms + 500 Watts RMS X 1 At 2 OhmsSpecifications: Max Power: 1800W Peak RMS Power Output @ 2 (subwoofer): 500W x 1, <1% THD+N RMS Power Output @ 4 (subwoofer): 320W x 1, <1% THD+N RMS Power Output @ 2 (full range): 65W x 4, <1% THD+N RMS Power Output @ 4 (full range): 45W x 4, <1% THD+N RMS Power Output @ 4 Bridged (full range): 130W x 2, <1% THD+N Signal to Noise Ratio (sub): >80dB (ref 1W output @ 4) Signal to Noise Ratio (full range): >80dB (ref 1W output @ 4)