Want big bass? Look at our Subwoofers Alpine's MRD-M605 is a monster mono machine, ready to deliver the big watts to your subs. This powerful Class-D member of Alpine's V12 amplifier series delivers 400 watts of bass-bumping power to a 4-ohm load (600 watts at 2 ohms ) — an outstanding way to get the shake on with a sub or two!

The MRD-M605 features computerized digital controls that are second to none. Top-mounted Bass Engine digital controls allow a high level of fine-tuning, including a subsonic filter to remove inaudible, power-wasting ultra-low frequencies and Bass EQ, adjustable from 0-16 dB at 45 Hz.

You'll find a set of preamp outputs for routing signal to another amplifier for additional power. The extra-large wiring terminals will let your bass really hit, since heavy-gauge power and speaker wires let the power move more efficiently into and out of the amp. To keep the MRD-M605 running strong over the long haul, Alpine designed the amp for optimal internal air flow, including a built-in variable-speed cooling fan.

Note: Sorry, Crutchfield cannot ship Alpine products to Guam or Puerto Rico.

Product Highlights:

  • mono subwoofer car amplifier
  • 400 watts x 1 at 4 ohms (600 watts RMS x 1 at 2 ohms)
  • Class D design
  • internal, variable-speed cooling fan
  • Bass Engine® features:
    • low-pass digital filter, 30-200 Hz, with a selectable 12 or 24 dB/octave slope
    • selectable subsonic filter (off, 15Hz, or 30 Hz with 24 dB/octave slope)
    • Bass EQ (0-16 dB at 45 Hz)
  • top-mounted digital control center with cover
  • CEA-2006 compliant
  • optional remote level control
  • preamp inputs and outputs
  • extra-large terminals
  • fuse rating: 30A x 2
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • dimensions: 11-7/16"W x 2-7/16"H x 9"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 MRD-M605 Reviews

Average Customer Review:

15 reviews
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Would buy again

Written By Carl RS, Scranton, PA on Thursday, August 21, 2008

I have this amp powering 2 10" polk momo and they're a match made in car audio heaven. I recently added a capacitor and i'm no longer considering the mrd-m1005 unless i go with bigger subs but for now these are great. I love the punch and power this amp puts out but im mostly amazed of its size it fits anywhere. I'd buy this amp again if i had to no doubt about it. get it, its an alpine you'll thank yourself you did.


Written By Ty, Colorado Springs, CO on Wednesday, April 25, 2007

Crutchfield Customer Review (What's this?)

The quality of this amp is obvious just from looking at it. After buying two inferior amps, both of which were faulty, I bought this one from Crutchfield and am so glad I did. The sound reproduction is excellent! Don't make the same mistake I did, trying to squeeze out a good deal by being cheep...put out the few extra bucks and reward yourself with a solid, quality product like this one. Oh yeah, if you're wondering how much power is enouph... 600 watts RMS is plenty to make your hair move and your eye balls shake. I have this amp powering two 12" subs. The sound...and feel is fantastic.

great buy

Written By Erik, schererville, in on Monday, February 26, 2007

i have this amp hooked up to two 12 inch kicker cvr's wired to present a 2 ohm load. this amp really makes them move. my amp was rated at 648 watts rms. if you're looking to get a great amp at a decent price, i would highly recommend this amp.

Alpine MRD-M605

Written By chris, Waterbury , CT. on Friday, February 23, 2007

Very good amp,stylish look,and a great price,it's just perfect.I have mine hooked up to an MTX Thunder series box with two 12's and the base is earth shaking.If your reading this review do yourself a favor and buy this amp.

It literally blows!

Written By Tito, Garden Grove, CA on Friday, September 15, 2006

I have one of this thing powering an Alpine Type-R 1042D (set at 2 ohms, 600RMS), and when my sub hits, I can feel my hair being "blown away!" It's a powerful amp and smaller than some other less powerful amps. It doesn't heat up as much and I love the digital control. All the controls are on top which makes it easier to adjust (depending on your set-up).


Written By SticBandt, Grand Rapids, MI on Wednesday, August 30, 2006

I have two of them, each to one Type R 12 and WOW It sounds Amazing! I will never buy anything else thats not Alpine. So much Clarity as is Loud! To tell you the truth I cant even turn it up all the way...It blurs my vision too much anyways Awesome AMP!


Written By matt, Florida on Tuesday, July 11, 2006

well if you like loud and clear bass than here ya go!, i got this pushing 2 12" infinity kappa perfects, the subs say 350 rms, my amp says 600 but tested at 662 rms, 2 ohms, this thing pushes them loud and clear!! i love the digital display, always nice to know your voltage and temperature. it help with seeing where the coolest spot is to install the amp, plus the fan helps if it gets too hot but it hasnt had to come on yet. the 4 gauge power terminals "inside" the amp make for a clean look and this thing is small! doesn't take up much space i love this amp!! one of the best mid-range sub-amps i've used or seen and believe me i know systems!

Great Amp

Written By Ace8904, Fort Madison, Iowa on Tuesday, July 11, 2006

In my opinion this is the best amp you can buy, for its size. I have it powering two Alpine type E's (soon to be type S's) and i love it. The subs matched with the amp are a perfect harmony and sound amazing, but that is always what you get when you buy Alpine.

Alpine MRD-M605

Written By alex, port arthur, TEXAS on Tuesday, May 30, 2006

Crutchfield Customer Review (What's this?)

best amp i ever bought!! pushin 2 alpine 10in E's in a custom box under the rear seat of an '05 Dodge quadcab. out hits my friends 12s the fan is really nice it hasnt over heated. also like the digital display it tells the temp/volts of your amp. the only down side is the controls under the cover, but i have an alpine 9855 head unit with amplink its really great all controls are done on the head unit.

High Quality

Written By Tony, Florida on Saturday, May 13, 2006

Crutchfield Customer Review (What's this?)

I've had this amp for about a month now and it has really proven to be a great quality high power amp. I like the idea that it is fan cooled and it just looks incredibly clean. I have it configured in 2 ohm mode and it just keeps going no matter what i throw at it it just continues to perform.

Alpine MRD-M605

Written By alex, Eden Prairie, MN on Tuesday, January 03, 2006

i got this amp powering 2 10 inch alpine type e's in the back of my 98 olds cutlass and man do they thump. alpine rates this thing at 600 watts and mine got an actuall rating of 673 so u definitly wont be short of power.
i listen to a lot of rock and metal and these sound great with e double bass no distortion or anything.
would definitly recomend this to anyone.

Excellent Amp!

Written By Neihn, Kansas City on Monday, November 21, 2005

I have 2 of these powering 2 Alpine type E subs and boy do they ever kick. Rated at 600W @ 2ohm but both tested at about 660W. Well worth the money. Like another reviewer said kinda of a pain to have to remove the cover to adjust any settings but I can live with it knowing what these things can do.

kicking amp

Written By Jason, St. Paul, MN on Tuesday, September 06, 2005

This amp puts out ALOT of power. It's rated at 600 RMS @ 2 ohms but tested at 662 RMS!! I have it powering 1 infinity 12" perfect DVQ in a 1 cubic foot sealed box and it hits HARD. I would recommend this amp to anyone who wants totally clear sound with a ton of power to back it up. The only complaint I have is that you have to take the silver cover off to change any settings. (unless you have it linked to your alpine head unit)
If you want awesome power then this is the amp for you. I also plan to get the Alpine 75w x 4 V12 amp because I'm so impressed with this one.

Awesome Amp!

Written By Alex, Puyallup, WA on Friday, June 10, 2005

Crutchfield Customer Review (What's this?)

Love this amp! It's a pimp! I have one hooked up to an Alpine SWR-1242D in a Q-Logic 1.75cube vented box and for 600+ watts, it hits you hard, right in the grill! Do your homework and hook it up right.


Written By jstauffer, Brunswick, MD on Friday, April 29, 2005

Crutchfield Customer Review (What's this?)

I upgraded to this amp from the Alpine MRD-M301 so that I could use the amplink function with my Alpine CDA-9855.

This amp sounds amazing, and the actual rating from Alpine was 637W.

I highly recommend this amp to anyone looking for an awesome sound from their subs.

Hands-on research

What's in the box?

Download owner's manual

  • Mono amplifier
  • 4mm Allen wrench
  • 2.5mm Allen wrench
  • 4 Self-tapping screws (M4 x 20mm)
  • Manual (English/French/Spanish)
  • Customer Care Registration/Survey
  • Warranty sheet
  • Verification Certificate

Product Research

Inputs and Outputs Notes


V12 AccuClass-D Mono Amplifier: The V12 AccuClass-D amplifier design delivers massive power without correspondingly huge current draw. This amplifier's true digital design keeps the signal purer and makes the amp extremely efficient (approximately 80%). V12 AccuClass-D amps use digital signal processing to adjust input gain, crossover point, and Bass EQ, all controlled using the Alpine Digital Control Center located under the top-mounted access panel.

Hood: The amplifier has a hinged brushed aluminum hood that flips up to reveal the control panel and LCD display. The control panel consists of three buttons: Mode, Up (>), and Down (<). These buttons are used to navigate the menu which includes all the adjustments on the amp. When closed, the LCD display is visible through the plastic window. Two Allen-head screws secure the hood.

Display: The MRD-M605 features a blue backlit display that allows you to monitor the DC input voltage or the internal temperature (Fahrenheit or Celsius). The display is also used when adjusting the Amp ID, input gain, crossover point, and bass EQ.

Verification Certificate: The amplifier comes with a certificate that specifies the measured total RMS output of the particular amplifier. It lists the model number, serial number, test date, and the test conditions (voltage, impedance).

Bass EQ: A bass boost is available at 45 Hz. The boost level is adjustable from 0 to 16 dB in 2 dB steps.

Built-in Variable Crossover: The built-in low-pass crossover is adjustable from 30 to 200Hz with 13 settings (30, 38, 45, 53, 60, 72, 85, 95, 110, 125, 140, 170, and 200 Hz). The slope is switchable, 12dB/octave or 24dB/octave.

Subsonic Filter: The subsonic filter is used to remove low frequencies that you cannot hear but can "rob" power from the amplifier. The crossover point is switchable between 15Hz and 30Hz, and can be turned off.

Multi-Amp Installation: Because the above Bass Engine adjustments are all digital and discrete, two of these amplifiers can be used to power the two voice coils of a DVC woofer. Note: Technically this is true of any amp, but with analog adjustments an oscilloscope is needed to ensure the outputs are identical.

3-Way Protection Circuitry: This amplifier has a 3-way protection circuitry to guard against damage from undesired conditions. It includes protection for Short circuit (excessive current), Over-voltage, and Thermal overload. When the amplifier goes into protection mode, the LCD display shows an Error code explaining the cause of the failure.

Inputs and Outputs Notes

Battery (+12 V)/Ground (GND): The Battery and Ground terminals are set-screw terminals that will accept up to 4 gauge wire. A 4mm Allen wrench is included to tighten/loosen the set screws.

Remote (turn-on): The remote terminal is a set screw terminal that will accept up to 8 gauge wire. A 2.5mm Allen wrench is included to tighten/loosen the set screws.

Speaker Output: The speaker terminals are set-screw terminals that will accept up to 8 gauge wire. The same 2.5mm Allen wrench is used for this terminal.

RCA Input/Output: The amplifier includes gold-plated RCA line input jacks and gold-plated RCA line output jacks, there is no speaker-level input.

Amplifier Link: The amp has a female DIN jack for connection to a 2005 or newer receiver with Amplifier Link controls. The Amp Link feature on the new amplifiers is not backward compatible with pre 2005 receivers. An Alpine KCE-511M cable is needed to connect the amp to a compatible receiver. Up to 8 Amp Link compatible amplifiers can be controlled by the receiver using KWE-061M "Y" adapters.


CEA-2006 Compliance: The specifications given by Alpine for the MRD-M605 amplifier comply with the new CEA-2006 Amplifier Power Standard from the CEA (Consumer Electronics Association). All manufacturers who comply with the standard can display the CEA-2006 logo on their product.

RMS Power Rating (measured at 14.4V):

  • Into a 4-Ohm Load: 400 watts x 1
  • Into a 2-Ohm Load: 600 watts x 1

Note: Minimum impedance is 2 Ohms.

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 verify what’s in the box, 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.