Alpine's X-Power amplifiers use the latest amp technology to play your music loud and clean without taking up much space. And these amps employ some of the same circuitry developed for Alpine's top-of-the-line PDX digital amps, so they'll bring exceptional sound to almost any ride.

The MRX-M50 mono amp puts out up to 1,000 watts RMS to your subwoofer system, so you can fill your listening space with plenty of bass. And it'll operate safely with a 1-ohm load, making it useful in a variety of sub system installations. Onboard low-pass and subsonic filters let you get the best sound out of your setup, while a bass boost helps to fatten up the sound if you need it.

A power management system optimizes the amp's performance and keeps the music playing, even when you're pushing it hot and hard for a long time. Speaker-level inputs with an automatic turn-on feature simplify system hook-up.

Product Highlights:

  • mono subwoofer car amplifier
  • 600 watts RMS x 1 at 4 ohms (1,000 watts RMS x 1 at 2 ohms)
  • 500 watts RMS x 1 at 1 ohm
  • CEA-2006 compliant
  • variable low-pass filter (50-400 Hz, 12 dB/octave)
  • variable bass boost (0-12 dB at 50 Hz)
  • variable subsonic filter (5-30 Hz, 24 dB/octave)
  • optional remote level control (RUX-KNOB)
  • Class D amp with MOSFET power supply
  • preamp and speaker-level inputs
  • fuse rating: 25A x 4
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 13-1/2"W x 2-5/16"H x 9-1/16"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Alpine MRX-M100 Reviews

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Written By Romeo, Hilo,Hi on Friday, January 20, 2012

Awsome amp paired with a curent gen alpine type r at 2ohm's and it rocks could ask for more power for one sub although if u gonna run more then one high quality sub you should really get one for each sub

Pros: great power,low current draw keep highlights brite,clean sound

Cons: could use a bit bigger end cap cover although it covers the wires nicly if you are trying to do the stealthy type of install you will still see the wires a bit

Hands-on research

What's in the box?

Download owner's manual

  • Mono subwoofer amplifier
  • Four 25A ATO fuses (installed)
  • 7" Speaker-level input harness
  • Four 3/4" Self-tapping screws
  • 2 Terminal covers
  • Four 7/16" Terminal cover screws
  • 2.5mm Allen wrench
  • Owner's manual (English/ French/ Spanish)
  • Verification Certificate
  • Warranty information
  • Customer Care Registration card

Product Research



MRX Amplifier Design: Class-D amplifiers boast higher efficiency, produce less heat, and draw less current than traditional Class-AB amps. The new MRX series benefits from the technology trickledown from Alpine's more expensive PDX amps, including Direct FET final outputs, thermal management processor, 6-Layer Glass Epoxy PC Board; combining to create a high-end sound quality without the bulky heat sinks required by most amps in this power class.

STAR Topology: Alpine's unique STAR (Signal Transit for Accurate Response) Circuit PCB design provides a single common ground for all amp sub-blocks, preventing ground interference and minimizing internal noise.

Power Management Processor: The multi-stage Power Management Processor continuously monitors component temperatures throughout the amplifier and decreases power output if anything gets too hot. When playing music under heavy loads for long periods, the circuit automatically reduces power output slightly at first, and then further in a second stage if necessary. This two stage approach provides an interruption free listening experience.

CEA 2006 Compliant: The MRX-M100's power ratings are measured according to the Consumer Electronics Association CEA-2006 standards. These standards allow you to accurately compare the rated power output of all CEA 2006-compliant amplifiers, even different brands. Manufacturers who adhere to the standards can display the CEA 2006 logo on their products and packaging. The power output is measured from 20 Hz to 400 Hz using a 14.4 volt power supply:

  • 4-ohm: 600 watts with no more than 0.04% THD+N
  • 2-ohm: 1,000 watts with no more than 0.06% THD+N
  • 1-ohm: 500 watts (no THD+N figure given)

Signal-to-Noise: When measured under CEA-2006 conditions (reference 1 watt into a 4-ohm load) the signal to noise ratio is 90 dBA. Measured at the rated power output S/N is 117 dB.

Verification Certificate: The amplifier comes with a certificate that lists the RMS power output measured from that specific amplifier. It also lists the model number, serial number, test date, and the test conditions (voltage and impedance).

Auto Turn On: When using the speaker level inputs the X-Power amplifiers automatically turn on when voltage is detected on the signal inputs, making them an easy factory system upgrade.

Low Output Impedance: With low output impedance, the MRX-M100 outputs tightly controlled bass, with a damping Factor rated at greater than 1000.

LED: The top panel LED power indicator glows blue when the amplifier is turned on.


Gain: The MRX-M100's gain is set according to the level of the incoming signal. The line-level input gain setting is continuously variable from 200 mV to 4.0V; the speaker-level input gain setting is continuously variable from 500 mV to 10.0V.

Crossover: The low-pass crossover point is continuously variable from 50 to 400 Hz and the slope is 12 dB/oct; the crossover cannot be bypassed.

Subsonic Filter: The amp also has a 24 dB/oct subsonic filter, continuously variable from 5 to 30 Hz.

Bass EQ: Bass boost can be applied to the subwoofer output; it's variable from 0 to +12 dB and centered at 50 Hz.


Power/Ground/Remote: The MRX-M100 features set-screw terminals for the Power, Ground and Remote Turn-on inputs. The Power and Ground terminals will accommodate up to 4 gauge wire (Alpine recommends 4 gauge minimum), the Remote Turn-on terminal will accept up to 8 gauge wire.

Speaker Output: The speaker outputs terminal is also set-screw terminals and will accept up to 8 gauge wire.

Line Input/Output: Line level RCA is the preferred input connection. The full range stereo line output allows easily adding another amp without running a second set of cables.

Speaker Level Input: Use the included speaker level input harnesses if the connected radio has no preamp outputs.

Fuses: The amp is protected by four chassis mounted 25-amp ATO fuses.

Remote Bass Control (optional): Alpine's wired remote (item number 500RUXKNOB, sold separately) offers control of the subwoofer output level from the front of your vehicle for remote bass adjustments.

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