RA1-710.5 [Open Box]

The MB Quart RA1-710.5 is a 700 W five-channel car audio amplifier built to run four full-range speaker channels and a dedicated subwoofer channel from one unit, cutting down on the amp count needed for a complete system. Channel 5 is 1 ohm stable, delivering up to 350 W to a subwoofer while the four main channels split the remaining power for doors or a component front stage. DC signal sensing turns the amplifier on directly from an RCA signal, so no separate remote turn-on wire is required when wiring into an OEM head unit. A Class SQ (Class D) topology runs the full-range channels while a Class Q1 (Class D) stage handles the subwoofer channel, both built around MB Quart's FLUID-FET output devices for efficient power delivery. Variable electronic crossovers on every channel, plus a wired bass remote included in the box, let the low end be tuned and adjusted from the driver's seat without reaching behind the amp. An aluminum heat sink and a rugged MOSFET power supply keep the amplifier stable at low impedance loads for extended high-volume use.