Wet Sounds Sinister 4ch amp - 185 Watts RMS x 4 Sinister Series Full Range 4-Channel Class D Marine Amplifier | RMS Power Rating: 4 ohms: 185 watts x 4 chan. @ 60A | 2 ohms: 340 watts x 4 chan. @ 123A | Bridged, 4 ohms: 685 watts x 2 chan. @ 122A | Total RMS power output: 1370 watts Top Mounted Crossover Controls | Remote Level Control Included | Auto Turn On Sense Capability | Thermal Rollback Technology Horizontal or Vertical Placement | Provides Amplifier Status | Removable Speaker Plugs | Designed to accept a 12 AWG - 16 AWG wire High Level Speaker Input (requires adapter) | Please contact Wet Sounds for Information | Input Sensitivity: Variable from 200mV to 6.1V | Frequency Response: 8Hz - 50,000 Hz | Bass Boost: 0db - 12.5 dB @ 27Hz - 110Hz High-Pass Crossover Frequency: 30Hz - 300 Hz | Low-Pass Crossover Frequency: 30Hz - 300 Hz | S/N Ratio : &gt;90dB &gt;113dB | CEA 2006 Compliant | Dimensions: 9.82"W x 13.50"L x 2.70"H