Wet Sounds HTX-4 Class D 4 Channel Marine Amplifier HTX Series 4-Channel Class D Marine 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. | Total power output: 600 watts RMS | CEA-2006 Compliant Amplifier Pulse Width Modulated MOSFET power supply | LED power (blue) and protect (red) indicators | Removable crossover/level control cover | Removable wire terminals/plugs | Conformal coated PCB boards | Completely sealed, salt-water compliant high mass heat sink Fully stainless steel hardware | Soft start turn-on | 4, 3 or 2 channel operation | 3-way protection circuitry (thermal, overload, and speaker short protection) | Dual speaker terminals simplify the hookup of multiple speakers | Heavy duty aluminum alloy heat-sink for extreme heat dissipation Input sensitivity: 200mV - 6.1V | Frequency Response: 7 - 33,000 Hz | Total Harmonic Distortion (THD): 85 dB (75 watts @4ohms) | Selectable Crossover Modes (Ch1-4): Low / High Variable crossover filter: 50 - 250 Hz, 12 dB/octave | Fuse Rating: 25 A x 2 | Speaker connections accept 12 - 16 AWG wiring | Dimensions: 7.126"W x 9.527"L x 3.000"H