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MB Quart compact 400 watt mono Powersports amplifier to for a subwoofer with on-board equalization and simple installation with quick release connectors.


  • MARINE GRADE PROTECTION/IPX RATING:  Amplifiers are ASTM certified which defines that marine amplifiers must use conformal coated PC boards to resist corrosion from salt spray & moisture
  • LOW NOISE PREAMPLIFIER CIRCUIT:  Q-Stasis Pre Amplifier Stage: The highly engineered Q-Stasis pre-amplifier stage reduces incoming noise from source units dramatically improving sound quality.
  • RCA INPUTS:  2 Pair RCA Nickel-Plated: High temperature impact resistant with hex screw terminals that allow for secure connections and is erosion resistant
  • OPERATION MODE:  Mono operation: Designed to power 1 subwoofer or subwoofer system 
  • CLASS/ TOPOLOGY:  Full Range Class D: Highly efficient circuit topology which helps the amplifer develop a lot of power in a very small heatsink.
  • OUTPUT DEVICE TECHNOLOGY:  PWM MOSFET Power Supply: Stable power through the PC board with minimal heat generation.
  • HEAT SINK:  Aluminum: Quickly dissapates heat to allow the amplifer to run lower impedance for longer duration.
  • POWER SUPPLY:  Simpatico Coil Design: The dual coil Pulse Width Modulated power supply keeps voltage constant through the Ultra-Fi output devices
  • CONNECTION TYPE:  Nickel-plated connections: Nickel plated corrosion resistant connections.
  • LED SYSTEM PROTECTION CIRCUITRY DIAGNOSTICS:  Three-stage protection circuits: Monitor thermal, overload, DC, and speaker short protection with lighted indicators on the amplifier end panel.
  • CROSSOVER / SIGNAL SHAPING:  Complete control of amplifier signal, essential when using two or more amplifiers
  • OUTPUT CONNECTIONS:  When you are putting machine up for the winter of as a security precaution


  • Class Full Range:  Class D
  • Variable Voltage:  0.2V~9V
  • Signal To Noise Ratio:   >100dB
  • Frequency Response:  10Hz-300kHz
  • Crossover Type Electronic:  12dB Per Octave
  • Low Pass Crossover Switch Low Pass:  300 HZ
  • Bass Boots:  0-12dB@45Hz
  • Subsonic Filter:  60Hz
  • Power @ 2-OHMS:  1 x 500W
  • Power @ 4-OHMS:  1 x 250W
  • Total Channels:  Mono
  • Audio Inputs:  RCA
  • Power Terminal 12V/GND: Molex Plug Connector
  • Speaker Terminal Wire Gauge Molex Plug Connector
  • Fusing: 1 x 30 Amps
  • Certifications:  Marine & Powersports
  • Dimensions:  3.70 X 5.51 X 1.77 IN ( 9.4X14.0X4.5CM)
  • Weight: 2.098 lbs (0.95 kg)