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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

Product 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

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.

Hands-on 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

Product Research

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.

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.

Alpine MRX-F35 Reviews

Average Customer Review:

15 reviews
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Great addition

Written By Steve K, New York on Saturday, December 06, 2014

Crutchfield Customer Review (What's this?)

A great addition to my system. Replaced an older Infinity 4 channel amp that failed. Nice clean high's and warm Bass, This amp is probably under-rated at 45 watts r.m.s. but this guys not complaining at all. Very pleased!

Pros: Small footprint, cool running, true realistic sound.

Cons: None as yet.

Alpine MRX F35 amp

Written By Djs, Beverly,MA on Monday, November 24, 2014

Crutchfield Customer Review (What's this?)

Amp was at great deal for the money. Easy, straight forward install. Had 20 year old Sony 4 x 27W amp. This was a huge improvement. Sound is excellent, brought out much more bass from my 6 x 9 speakers. Only using about 40% of power available from amp before overpowering space in Frontier. No distortion pushing my Kenwood head unit to full power. Was installed under front passenger seat.

Pros: Easy install, clear distortion free power. Small size relative to some other amps.

Cons: None

Fantastic Product

Written By Brandon B, Bolivar, Ohio on Thursday, November 20, 2014

Crutchfield Customer Review (What's this?)

This amp is amazing. I use it to run four Alpine Type-R 6x8's and they produce great sound. This amp is relatively small so it can fit right under your seat like it's not even there. Alpine never falls short of making spectacular products. I highly recommend this product to anyone that needs a little more power for their speakers.

Pros: Size, design, Alpine Quality that never fails, and the price is just right

Cons: none

Alpine MRX-F35

Written By RoyW, Mims, FL on Thursday, November 13, 2014

Crutchfield Customer Review (What's this?)

Everything i was looking for to push the speakers I wanted. Replaced 4 - 6-1/2" stock speakers with Kicker 40CS654 and this amp, and it sounds ridiculously good sound. Ofcourse that after I rewired to get speakers in Phase - Oh Well!

Pros: Easy to install, plenty of power for what I needed, looks good, and priced right.

Cons: None yet!

Alpine 4 Channel Amp

Written By Sam, Carson City on Thursday, November 06, 2014

Crutchfield Customer Review (What's this?)

Great product, small size allows install in various locations. I installed under my back seat in my Jeep.

Pros: Good Price, easy installation. Brought my speakers to life.

Cons: I Have nothing negative to say about this product.

Alpine all the way

Written By lobo88, houston tx 77064 on Friday, October 17, 2014

Crutchfield Customer Review (What's this?)

This Alpine Amp is the bomb

Pros: 4 channel good sound

Cons: All is good no conns

amp upgrade

Written By ck, stone mtn ga. on Tuesday, October 14, 2014

Crutchfield Customer Review (What's this?)

Amp was very easy to install and sounds great......ck

Pros: More power than rated

DreamSeeker2

Written By Pete, Beaufort, SC on Sunday, September 28, 2014

Crutchfield Customer Review (What's this?)

Great power. Was installed professionally. Uses less than 3 DC amps. Very satisfied.

Great 4 Channel Amp

Written By Michael, Guthrie on Friday, August 29, 2014

Crutchfield Customer Review (What's this?)

Great sound and Alpine certificate shows RMS rating 20 amps higher than advertised making it even a better buy.

Pros: Sounds great driving focal component speakers and some rear door 6 1/2" speakers.

Cons: None

Alpine MRX-F35

Written By Anonymous, Scottsville, Va on Saturday, August 23, 2014

Awesome

Pros: Easy to install and tweek

Very Satisfied

Written By DAVID CLARK, Auburn, WA on Sunday, August 17, 2014

I up graded from f300 and the difference was very noticeable I have it pushing all 4 6×9s in my 2012 Dodge Avenger I have 2 Rockford Fosgate Prime Component speakers in the front and 2 JL Audio C5s in the rear the bass is awesome and the highs are clean

Pros: I recommend this to everyone it's a great buy and the price is right

Cons: Haven't found any

Great Amp

Written By Josh, Commifornia on Tuesday, July 22, 2014

Great deal on a great amp. I'm using this to power my front and rear speakers paired with the mdv-500 for my sub and everything sounds phenomenal. Take the time to tune it with a multimeter and you'll be good to go.

Pros: Great price, Great performance, looks clean

Cons: none

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

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.

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

Get everything you’ll need to enjoy your new Alpine MRX-F35

Bring the music from your amp to your speakers.
Patch cables take the music from your stereo to the amplifier. Most amp wiring kits don't include them.
For multi-amp systems, you'll need a separate fuse holder.
Helps protect your car's charging system and improves power handling. Required power and ground wires not included with cap.
The right tools will make the installation easier.
Rockford Fosgate RFK8i

Rockford Fosgate RFK8i

8-gauge amplifier power and signal wiring kit

Item #: 575RFK8I

(30)

$74.99
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T-Spec 8PK Installation Kit

T-Spec 8PK Installation Kit

8-gauge amplifier wiring kit — includes speaker wire

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EFX PA8BX Wiring Kit

EFX PA8BX Wiring Kit

8-gauge amplifier wiring kit — includes 2-channel patch cable

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Rockford Fosgate RFK8

Rockford Fosgate RFK8

8-gauge amplifier power wiring kit

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Kicker PK8

Kicker PK8

8-gauge amplifier power wiring kit

Item #: 206PK8

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T-Spec 8RAK Installation Kit

T-Spec 8RAK Installation Kit

8-gauge amplifier wiring kit — includes 2-channel patch cable and speaker wire

Item #: 1208RAK

(3)

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T-Spec V10-RAK8

T-Spec V10-RAK8

8-gauge amplifier wiring kit — includes 2-channel patch cable

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Kicker CK8

Kicker CK8

Complete 8-gauge amplifier wiring kit — includes 2-channel patch cable and speaker wire

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Stinger PRO Series Speaker Wire

Stinger PRO Series Speaker Wire

Priced per foot (14 Gauge)

Item #: 541SPW514B

(52)

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T-Spec 16-gauge Speaker Wire

T-Spec 16-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW16WB1

(13)

T-Spec 12-gauge Speaker Wire

T-Spec 12-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW12WB1

(30)

T-Spec 2-Channel RCA Patch Cables

T-Spec 2-Channel RCA Patch Cables

Available in 7 different lengths (20-foot)

Item #: 120RCA202

(27)

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T-Spec 4-Channel RCA Patch Cable

T-Spec 4-Channel RCA Patch Cable

17-foot length

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EFX 17-foot RCA Patch Cable

EFX 17-foot RCA Patch Cable

Item #: 142A17C

(55)

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After $2.00 Savings Add to Cart
EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Reference Series Multi-Core RCA patch cables — available in 5 different lengths (12-foot)

Item #: 142RR12

$19.95
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EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Core Series Twisted RCA patch cables — available in 5 different lengths (17-foot)

Item #: 142RCT17B

$12.95
Add to Cart
EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Elite Series Braided Multi-Core RCA patch cables — available in 5 different lengths (6-foot)

Item #: 142RE6

$49.95
Add to Cart
EFX CFHG4 Fuse Holder

EFX CFHG4 Fuse Holder

In-line AGU fuse holder accepts 4- to 8-gauge wire

Item #: 142CFHG4

Rockford Fosgate RFFAGU Fuse Holder

Rockford Fosgate RFFAGU Fuse Holder

Platinum-plated AGU fuse holder
Fits 4- or 8-gauge cable

Item #: 575RFFAGU

(25)

$10.99
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T-Spec Capacitor

T-Spec Capacitor

1.5-farad capacitor with red LCD meter

Item #: 12015DDC

(11)

$79.99
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S&G Wire Cutter/Stripper Tool

S&G Wire Cutter/Stripper Tool

Cuts and strips 12- to 22-gauge wire

Item #: 18119100

(17)

$19.99
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Metra Crimp Tool and Connectors

Metra Crimp Tool and Connectors

Package contains crimp tool and over 150 pieces

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(15)

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Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6NGL

(53)

$24.99
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Pro.Fit Wire Worm

Pro.Fit Wire Worm

Installation tool helps route wiring through tight spaces

Item #: 042DM4533

(34)

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S&G Tool Aid 87650

S&G Tool Aid 87650

Door Trim and Panel Removal Tool

Item #: 18187650

(71)

Skewdriver Pro SPK4042

Skewdriver Pro SPK4042

Ratcheting straight and offset screwdriver set with 40 bits (Skewdriver Pro with ratchet handle, pictured)

Item #: 180SPK4042

(8)

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Install Bay 3320

Install Bay 3320

Auto-ranging digital multimeter

Item #: 1203320

$39.99
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Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6LNGL

(2)

$29.99
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Install Bay IB35400

Install Bay IB35400

Premium door panel and trim tool

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$15.99
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DEI Heat Shrink Tubing

DEI Heat Shrink Tubing

Black 4-foot length (Assortment)

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(8)

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Autosound 2000 Disc Two

Autosound 2000 Disc Two

Image/Placement Test CD

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Questions & Answers Ask the community. Share your knowledge.

1 question already asked

Unsure but amp works great love quality of sound [ MICHAEL  Jul 18, 2014 ]
Yep, epic though [ Nathan  Jul 17, 2014 ]
Designed by Alpine in Japan. Made in China. [ Christian  Jul 17, 2014 ]
Not sure but I had two alpine amps before they last like no tomorrow my last one was still working 8years later. I sold the car so I bought new alpine. I hope this helps. [ Robert  Jul 17, 2014 ]