RA1-750.1 750W Mono Car Subwoofer Amplifier with Bass Remote

The MB Quart RA1-750.1 is a 750 W mono subwoofer amplifier built to run stable at 1 ohm, delivering its full rated power into a single low-impedance subwoofer load or splitting down to 300 W at 4 ohms for lighter setups. DC signal sensing turns the amplifier on directly from an RCA input, so it wires into an OEM head unit without needing a separate remote turn-on lead. A Class Q1 (Class D) topology built around MB Quart's FLUID-FET output devices focuses on efficient power delivery without sacrificing low-end sound quality, backed by a rugged MOSFET power supply that keeps output steady without overloading the vehicle's electrical system. A variable low-pass crossover from 50 Hz to 250 Hz, adjustable bass boost up to 12 dB, and a switchable subsonic filter give control over exactly which frequencies reach the subwoofer. The included wired bass remote lets bass level be adjusted from the driver's seat instead of reaching behind the amp, and an aluminum heat sink keeps the unit running cool through extended high-power use.