• Alpine MRX-M55 Mono Digital Power Amplifier

Alpine MRX-M55 Mono Digital Power Amplifier

These digital powerhouses are so efficient, they’re much more compact than you expect. Advanced thermal protection means you can play them loud and the music never stops.

All Digital Lineup
The X-Power series uses much of the same digital technology as the PDX series, achieving high efficiency with excellent audio performance, including low distortion, high damping factor and high S/N ratio.

Easily Upgrade Any System
Speaker Level Inputs let you connect these amps directly to factory-installed head units that do not have preamp outputs, so you can upgrade the original system with higher power and better speakers.

Remote Sensing
The remote sensing function turns the power on automatically when the amp detects an incoming audio signal. There is no more need for an extra remote line.

Smaller Footprint
PDX digital technology means high efficiency, so the X-Power amps are up to 29% more compact than previous models, making installation even more convenient.

Effective Heat Protection
If interior heat reaches unacceptably high levels, a Thermal Protection circuit decreases power in two steps rather than interrupting the music. It also provides over-voltage and overcurrent protection.

Remote Control Bass Knob (RUX-KNOB)
Simply add the RUX-KNOB (sold separately) and get full control from the dash for instant bass adjustment. You also get the ability to control multiple amps from just one controller with simple telephone cord adapters


  •     Terminal Layout: Two-Sided
  •     Screw Mount / Wire Cover: Integrated Wire and Mounting Screw Terminals


  •     Amplifier Type: Class-D (Digital)
  •     Channel Design: 1 Channel (Mono)
  •     Thermal Control: Thermal Management Control
  •     Power Supply: MOSFET
  •     Power Supply Design: DC-DC PWM Power Supply
  •     Board Circuitry: S.T.A.R. Circuitry
  •     Current Protection: Over-Current, Over-Voltage and Thermal Protection
  •     Power Indicator: Top Mounted Blue LED Power Indicator
  •     Speaker-Level Inputs
  •     Crossover: Variable Lowpass Filter
  •     Built-in Bass EQ
  •     Built-in Subsonic Filter
  •     Final Outputs: Direct FET
  •     Board Design: 6-layer Glass Epoxy PC Board
  •     Gain Control: Continuously Adjustable Gain Control
  •     Bass Control: Remote Bass Control ( RUX-KNOB sold separately )

Max Power Output Ratings

  •     Max Power: 1100W

RMS Power Ratings

  •     Per Channel into 4ohms, 14.4V (>THD+N): 350W
  •     Per Channel into 2ohms, 14.4V (>THD+N): 550W

Sound Tuning

  •     Crossover Frequency (LPF): 50 - 400Hz (-24dB/oct.)
  •     EQ (Equalizer): Bass EQ (fc=50Hz) 0 to +12dB
  •     Subsonic: 5 - 30Hz (-24dB/oct.)


  •     Heat Sink: 190 x 58 x 230 mm
  •     Footprint: 250 x 58 x 230 mm


  •     Power Requirements: 14.4V DC (11 - 16V)
  •     Input Sensitivity (RCA Input): 0.1 - 4.0V
  •     Input Sensitivity (Speaker Level Input): 0.25 - 10V
  •     Input Impedance: >10k ohms
  •     Frequency Response (+0, -3dB: 1W into 4 ohms): 5 - 400Hz
  •     Frequency Response (+0, -1dB: 1W into 4 ohms): 10 - 300Hz
  •     THD+N (10W into 4 ohms): <0.004%
  •     THD+N (Rated Power into 4 ohms): <0.06%
  •     Damping Factor: >1000
  •     Signal to Noise (Rated Power into 4 ohms): 114dB
  •     Preamp Output: 4V max.
  •     Remote Level: 0 to -20dB ( RUX-KNOB Required )
  •     Weight: 2.6kg
  • Amplifiers
  • 1 Channel (Mono)

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Alpine MRX-M55 Mono Digital Power Amplifier

  • £259.99