Onyx Series 4-Channel Class SQ Car AmplifierMax Power Rating:4 ohms: 75 watts x 4 chan.2 ohms: 150 watts x 4 chan.Bridged, 4 ohms: 300 watts x 2 chan.FLUID-FETS MOSFET Circuit maximizing power efficiency while improving sound qualityLED power (green) and protect (red) indicatorsVariable Bass Boost (0 to +9 dB bass boost)Built-in system diagnostics4/3/2/1 Channel operationPreamp RCA outputs to daisy chain multiple amps3-way protection circuitry (thermal, overload, and speaker short protection)Heavy duty Black Onyx aluminum alloy heat-sink with illuminated MB Quart designInput sensitivity:Level: 200mV-6VVariable high-pass filter (10-1,200 Hz 24 dB/octave)Variable low-pass filter (30-150 Hz 24 dB/octave)Frequency response: 10-45,000 Hz4 gauge power and ground wiring is required for installation. Contact us for information regarding a discount on select amplifier kits from our website when purchased together with this amplifier.Dimensions: 9-7/16"W x 11"L x 2-1/4"HAuthorized Internet Dealer1-year Manufacturer's Warranty