Seek perfection from sound.

Define your audio with Music. Defined.

SKU: MBQ-RA1-280.4



MB Quart RA1-280.4


70 x 4 RMS POWER @ 4 OHMS

MB Quart Reference series four-channel car audio amplifier featuring innovative sound quality and power technology to run four full-range channels and a subwoofer channel.

Music. Defined. through you – This is MB Quart.

Transforming audio into an immersive soundscape of superior playback that places the listener directly in the centre of their music – MB Quart signifies the epitome of the car audio industry. When sound becomes fused with innovation through detail, durability, and performance – that is what Music is. Defined. sets forth on promising to everyone who desires more from their audio. Bringing out the best from every song, layering them with hidden details in every beat and note, and delivering an experience that exemplifies perfection in every audio solution is what MB Quart stands for.

MB Quart is a high-end audio brand known for its elaborate and distinctive designs while producing rich sound quality. Found in 1962, MB Quart began producing professional studio microphones and headphones at its headquarters in Obrigheim, Germany. Through research, innovation, and a dedication to the highest standard of sound quality, MB Quart continues to grow its product line throughout its 50-year history.

From amplifiers that feed adrenaline-fused quality into every song, to speakers that seek perfection in every treble, to subwoofers that move the ground beneath, to Jeep Tuned Audio Kits (for Jeep Wrangler and Jeep Gladiator) that demand adventure out of every journey — MB Quart has the solution for those who seek more from their audio crave.

Our slogan – Music. Defined. is the superior standard to how MB Quart holds itself accountable for pushing the bar forward. Consumers of these products can experience a wide range of audio solutions that will deliver all of their needs for Powersports and Marine machines. MB Quart continues to expand its horizons with a range of OEM partners that include Polaris® and Bobcat® by delivering audio products and solutions that integrate seamlessly into machines and vehicles.

The MB Quart brand is owned by Maxxsonics and is based near Chicago, IL, and continues to give those who want the best from their audio everything they demand and more. Define your passion for audio with playback that transforms sound into a concert-filled atmosphere of quality, power, loudness, and performance.

Seek perfection from sound.

Define your audio with Music. Defined.


Colour Black
Warranty 2 Years
Compatible Vehicles Universal
Amp Class Class SQ (Class D)
Amp Total Channels 4
Amp Max Power (watts) 280
Amp Power @ 1 Ohm (ch x watts)
Amp Power @ 2 Ohm (ch x watts) 4 x 70
Amp Power @ 4 Ohm (ch x watts) 4 x 50
Amp Mono Bridged @ 4 Ohms (ch x watts)
Amp Crossover Electronic
Amp Variable High Pass Crossover 12dB per Octave CH1 & CH2: Switched Full/HPF/LPF 50Hz-250Hz, CH3 & CH4: Switched Full/HPF/LPF 50Hz-250Hz
Amp Variable Low Pass Crossover 12dB per Octave CH1 & CH2: Switched Full/HPF/LPF 50Hz-250Hz, CH3 & CH4: Switched Full/HPF/LPF 50Hz-250Hz
Amp Speaker Terminal Wire Gauge 12 AWG
Amp Fusing 40A External
Low Noise Preamplifier Circuit Q-Stasis Pre Amplifier Stage: Maximum low voltage signal from the source unit comes into the amplifier circuit with minimal distortion.
RCA Inputs Nickel-Plated: High temperature impact resistant with hex screw terminals that allow for secure connections and is erosion resistant.
High Level Inputs See Auto-Sense Feature.
Operation Mode 2 / 4 Channel
Crossover Type Variable electronic crossovers allow for complete control of the sound.
Electronic Equalizer Control of amplifier output with on-board electronic crossover to tailor specific frequencies to speakers and subwoofers. Check specifications for specific frequencies for this amplifier.
Class / Topology Class SQ: Multi-channel amplifiers utilize the unique MB Quart Class SQ topology. Matched with Q-Stasis the sonic accuracy and clarity exceeds standard Class D amplifiers.
Output Device Technology FLUID-FETS: MB Quart output devices, FLUID-FETS are painstakingly selected for their ability to efficiently produce power and mimic the sound quality of the highest end home amplifiers.
Heat Sink Aluminum: Quickly dissipates heat to allow the amplifier to run lower impedance for longer duration.
Power Supply Rugged MOSFET Pulse Width Modulation power supply: Allows amplifier to produce efficient power without taxing the vehicle electrical system.
Output Connections Heavy duty connections allow for secure electrical signal to pass into wiring and resist erosion which will add longevity to the amplifier.
Connection Type Secure connection for all power, ground and speaker connections.
LED System Protection Circuitry Diagnostics
Bass Remote Included
Auto Turn-On DC SIGNAL SENSE: The DC SIGNAL SENSE switch will allow the amp to turn on when a signal is received on the RCA inputs, so an amplifier remote turn on wire is not needed to turn on the amplifier. This feature can also be turned off.


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