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Crutchfield

Alpine MRX-F35

4-channel car amplifier — 55 watts RMS x 4

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  • Alpine MRX-F35

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  • Alpine MRX-F35

  • Alpine MRX-F35

  • Alpine MRX-F35

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Our take on the Alpine MRX-F35

by Buck Pomerantz
Alpine

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 Authorized Online Dealer

Digital technology that sounds perfect

Alpine's X-Power MRX-F35 4-channel amplifier uses the latest in amp technology to play your music loud and clean without taking up much space. And this compact amp employs some of the same circuitry developed for Alpine's top-of-the-line PDX digital amps so it'll bring exceptional sound to your ride.

Alpine's X-Power MRX-F35 4-channel amplifier

Big power for clear sound

The MRX-F35 puts out 55 watts RMS per channel, so you'll have plenty of clean power to fill your listening space with music. You can even use it in 2-channel mode to drive a pair of subs with 170 watts each. Onboard frequency filters let you tailor the output to fit your setup, and a bass boost on the rear channels helps to fatten up the sound.

Alpine reliability

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.

MRX-F35 control panel

Highlights:

  • 4-channel car amplifier
  • 55 watts RMS x 4 at 4 ohms (85 watts RMS x 4 at 2 ohms)
  • 170 watts RMS x 2 in bridged mode (4-ohm stable in bridged mode)
  • CEA-2006 compliant
  • variable high- and low-pass filters (50-400 Hz, 12 dB/octave)
  • variable bass boost (0-12 dB at 50 Hz) on rear channels
  • preamp and speaker-level inputs
  • Class-D amplifier design
  • MOSFET power and output stages
  • fuse rating: 25A x 2
  • 8-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 9-15/16"W x 2-5/16"H x 9-1/16"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
 

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Performance
RMS Power Output (Watts x Channels)
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55 x 4
Peak Power Output (Watts x Channels)
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---
Power at 2 Ohms (Watts x Channels)
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85 x 4
Bridged Power (Watts x Channels)
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170 x 2
Minimum Impedance Bridged
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4
Minimum Impedance Unbridged
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2
Best Frequency Response
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5-45k Hz
THD at Rated RMS Power
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1%
Signal to Noise Ratio
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87 dB
Input Voltage
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14.4v
Features
Amplifier Class
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D
Low-Pass Crossover Frequency
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50-400 Hz
Low-Pass Slope (dB/octave)
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12 dB/oct
High-Pass Crossover Frequency
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50-400 Hz
High-Pass Slope (dB/octave)
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12 dB/oct
Bass Boost
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0-12 dB
Bass Boost Frequency
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50 Hz
Fan Cooled
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No
Fuse Rating
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50
Speaker Level Inputs
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Harness
Preamp Outputs
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No
Width (inches)
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9-15/16
Height (inches)
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2-5/16
Depth (inches)
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9-1/16
Parts Warranty
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1 Year
Labor Warranty
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1 Year
Product Research
What's in the box?

Download owner's manual

  • 4-Channel amplifier with two 25A ATO fuses installed
  • Left plastic terminal cover
  • Right plastic terminal cover
  • 4 Terminal cover screws (M3 x 10mm)
  • 4 Self-tapping screws (M4 x 20mm)
  • 2.5mm Allen wrench
  • 7" Speaker-level input harness
  • Owner's Manual (Eng/ Fren/ Span)
  • Warranty sheet
  • Online registration card
  • Alpine Verification Certificate

Scratch & Dent items may be missing non-essential accessories. In some cases the manufacturer's accessories have been replaced with generic equivalents.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Features
Controls
Connections

Features

MRX Amplifier Design: Class-D amplifiers boast higher efficiency, produce less heat, and draw less current than traditional Class-AB amps. The 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-F35'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 20 kHz using a 14.4 volt power supply with no more than 0.01% THD+N:

  • 4-ohms: 55 watts RMS x 4
  • 2-ohms: 85 watts RMS x 4
  • 4-ohm bridged: 170 watts RMS x 2

Signal-to-Noise: When measured under CEA-2006 conditions (reference 1 watt into a 4-ohm load) the signal to noise ratio is 87 dBA. Measured at the rated power output S/N is 104 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-F35 outputs tightly controlled bass, with a damping Factor rated at greater than 500.

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

Controls

Gain: The MRX-F35's gain can be independently set for the front and rear channels. 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.

Crossovers: The amplifier has independent built-in crossovers for the front and rear channels. They can be set to low-pass or high-pass operation, or off via a three-way switch. The crossover frequency is continuously variable from 50 to 400 Hz and the slope is 12 dB/oct.

Bass EQ: Bass boost for the rear channels is variable from 0 to +12 dB and centered at 50 Hz.

Connections

Power/Ground/Remote: The MRX-F35 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, while the Remote Turn-on terminal will accept up to 8 gauge wire. Based on the fuse rating and power output, 8 gauge power and ground wires are recommended.

Speaker Output: The speaker output terminals are screw terminals which will accept up to 8 gauge wire.

Line Inputs: Line level RCA is the preferred input connection. There are two pairs of RCA line-level inputs. No line output is provided.

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

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

 
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Alpine MRX-F35 Reviews

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5 out of 5

Wow

Written By DLW, Mansfield, TX on Saturday, February 01, 2014
 
I tell you what, I thought the MRV-F300 was a pretty good amp...this F35 DEFINITELY takes things to the next level. I'm powering a set of Boston Acoustics 6.5s and 5.5s, and this amp MORE than handles them. When tuning it, gain all the way down, I was able to dial up my 148BT to it's max, hearing no audible distortion. As it is, I only use about 2/3's of my 148BT's dynamic volume, so I tuned accordingly. This amp immediately showed it's teeth by providing me more power than it's rated 55w comes across as. I also immediately noticed how much heavier this amp was versus my F300. Another profound area of notice was when I went to check my eq settings after having installed this amp; it amplified the music at a much flatter curve than the F300. If you're looking at this amp, it's legit. Now, I've not heard the PDXs; but in the MRX, I'm a believer.
Pros:
More powerful than it's rated Size Clarity Quality of build
2 out of 2 people found this helpful
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4 out of 5

great so far

Written By Anonymous, WS on Monday, September 16, 2013
Crutchfield Customer Review (What's this?)
 
Seems great so far. Produces lots of bass. Install is pretty simple. High level inputs don't allow any gain without distortion.
Was this review helpful?    Yes | No
 
5 out of 5

Nice amp

Written By Just D, Long Island, NY on Sunday, August 25, 2013
Crutchfield Customer Review (What's this?)
 
Nice amp. Perfect for my classic Mini Cooper. VERY loud with clear sound
Was this review helpful?    Yes | No
 

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