MB Quart RA1-750.1 Reference Series 750W Class D Monoblock Car Amplifier with Bass Remote

The MB Quart RA1-750.1 is a 750-watt, 1-ohm stable Class D monoblock amplifier from MB Quart's Reference Series, engineered to deliver powerful, high-fidelity bass for car audio subwoofer systems. Built around MB Quart's proprietary Class Q1 (Q-Stasis) circuitry, this amp prioritizes both efficiency and sonic accuracy from the power supply through the output stage.

The RA1-750.1 features DC Signal Sensing, allowing seamless integration with factory (OEM) head units — no remote turn-on wire required. Simply connect an RCA cable from the source unit and the amplifier powers on automatically when a signal is detected. High-level speaker inputs are also supported for added installation flexibility.

Key Features:

• 750W RMS @ 1 ohm | 500W RMS @ 2 ohms | 300W RMS @ 4 ohms
• Class Q1 (Class D) topology with FLUID-FETS output devices for efficient power and premium sound quality
• Q-Stasis Pre-Amplifier Stage — minimizes incoming noise and distortion for cleaner audio signal
• Variable Low-Pass Crossover — 50Hz–250Hz, 12dB/octave for precise bass tuning
• Bass Boost — 0 to +12dB adjustable
• Subsonic Filter — OFF / 25Hz to protect subwoofers from damaging low frequencies
• DC Signal Sense — auto turn-on via RCA input, no remote wire needed for OEM integration
• MOSFET PWM Power Supply — efficient power delivery with minimal draw on vehicle electrical system
• Aluminum chassis — rapidly dissipates heat for sustained low-impedance operation
• Nickel-plated set-screw terminals — high-temperature, erosion-resistant connections for power, ground, and speaker wiring (accepts up to 12 AWG speaker wire)
• RCA and high-level inputs — compatible with virtually any head unit
• Signal-to-Noise Ratio: >99dB
• THD: <0.07%
• Frequency Response: 25Hz–250Hz
• Input Sensitivity: 0.02V–9V

What's Included:

• MB Quart RA1-750.1 Monoblock Amplifier
• Wired Bass Remote — mounts anywhere in the vehicle for convenient level adjustment

The RA1-750.1 delivers a potent combination of clean power and OEM-friendly installation features, making it an excellent choice for upgrading to a high-performance subwoofer system without sacrificing sound quality or ease of install.