- If you find a qualifying lower price online, call 1-866-859-0896 and provide a customer service agent the web site with the lower price.
- On qualifying products, AVLeaderz will verify the current price to complete the price match.
MB Quart RA1-280.4, Reference 4 Channel Full Range Amplifier - 280 Watts
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.
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.
WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to
