Fusion Entertainment SG-DA51600 Signature Series 5 Channel Marine Amplifier Powerful, rock-the-boat sound! 1600 watts of class D output run the speakers and sub off of one powerful amp 5-Channel, 1600 watt, class D amplifier and frequency response is 10Hz - 50kHz Can amplify up to 4 pairs on Fusion speakers (speakers run in Parallel on channels) and the ms-sw10 Fusion subwoofer 1-piece heavy-duty die cast chassis, 5-way circuitry protection - thermal/reversed power polarity/DC offset protection/high + low voltage Flfc low frequency control-accurate fine tuning of frequency response