RA1-280.4

Clean Power for Multi-Speaker Systems

The MB Quart Reference RA1-280.4 four-channel car amplifier is engineered to deliver clear, consistent power to your vehicle’s sound system. With a total peak output of 280 watts, this amplifier is ideal for powering front and rear speakers, providing a noticeable upgrade in volume, clarity, and overall sound quality compared to factory systems.

Precision Sound Control and Wide Frequency Range

Featuring variable electronic crossovers, the RA1-280.4 gives you full control over how sound is distributed to your speakers. Its wide frequency response of 10Hz–35kHz ensures accurate reproduction of deep lows, detailed mids, and crisp highs. The built-in bass control with 0–9dB boost allows you to fine-tune low-frequency output to match your listening preferences.

Efficient Class D Design with OEM Integration

Built on an efficient Class D MOSFET platform, this amplifier delivers strong performance while minimizing heat and power draw. DC sensing technology allows for easy integration into factory audio systems by adapting RCA cables from the source unit. Heavy-duty 4 AWG power terminals and 12 AWG speaker terminals ensure secure connections and reliable long-term operation.

Highlights:

• 4-channel Class D MOSFET car audio amplifier

• 280 watts total peak power output

• Power output: 4x70W @ 2 ohms

• Power output: 4x50W @ 4 ohms

• Variable electronic crossovers for precise tuning

• Wide frequency response: 10Hz–35kHz

• Built-in bass control with 0–9dB boost

• DC sensing for easy OEM system integration

• Efficient design with low heat generation

• 4 AWG power and 12 AWG speaker terminals

• Compact size for flexible installation options

What’s in the Package:

• MB Quart Reference RA1-280.4 4-Channel Amplifier

• Mounting hardware

• User manual / installation guide