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Marantz MM7055

5-channel power amplifier, 140 watts x 2

16 Reviews

Item # 642MM7055

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Our take on the Marantz MM7055

Even with the advent of 7.2- and 9.2-channel surround sound systems, most home theater lovers still opt for tried-and-true 5.1-channel sound. Recognizing this reality, Marantz built this 5-channel power plant as the primary companion to its AV7005 preamp/processor. You won't have to buy more amp channels than you need, but you can easily add one or more MM7025 2 x 140-watt amplifiers to your setup for more surround channels or multi-room audio.

Five channels of home theater horsepower

Even with the advent of 7.2- and 9.2-channel surround sound systems, most home theater lovers still opt for tried-and-true 5.1-channel sound. Recognizing this reality, Marantz built this 5-channel power plant as the primary companion to its AV7005 preamp/processor. You won't have to buy more amp channels than you need, but you can easily add one or more MM7025 2 x 140-watt amplifiers to your setup for more surround channels or multi-room audio.

Behind the MM7055's elegant facade lies a muscular, yet refined current-feedback amplifier design that excels at reproducing both fine musical detail and hair-raising transient peaks.

The MM7055 is comfortable driving high-performance speakers. If your preamp or A/V processor has XLR outputs, you can connect to this amp's XLR inputs and enjoy the superior sound quality they provide.

Product Highlights:

  • 5-channel power amplifier
  • 140 watts per channel into 8 ohms (20-20,000 Hz) at 0.08% THD, with 2 channels driven
  • frequency response: 8-100,000 Hz (±3 dB)
  • signal-to-noise ratio: 105 dB
  • one RCA and one XLR input for each channel
  • Discrete Current Feedback circuit for accurate, natural sound at all volume levels
  • DC trigger input/output
  • IR flasher input
  • massive power supply for high current and low noise
  • gold-plated binding post speaker terminals
  • detachable power cord
  • weight: 34.6 lbs.
  • 17-3/8"W x 7-1/4"H x 16-1/4"D
  • warranty: 3 years
  • Our 60-day money-back guarantee

What's in the Box:

  • 5-Channel power amplifier
  • 68" AC power cord
  • 44" Remote control cable (single RCA on both ends)
  • User guide (English/ French/ Spanish)
  • USA Warranty information
  • Canadian Warranty information

Strong and clean power. Has both balanced and unbalanced (RCA) inputs. Did not test on reference equipment, but this amp made a marked improvement over my previous amp.

Brandon, Little Rock, AR


Marantz MM7055 Reviews

Average Customer Review(s):

(16 Reviews)

Clean power

Brandon from Little Rock, AR on 9/10/2018

Crutchfield Customer Review (What's this?)

Strong and clean power. Has both balanced and unbalanced (RCA) inputs. Did not test on reference equipment, but this amp made a marked improvement over my previous amp.

Pros: Powerful clean power. Has balanced inputs. Looks great.

Cons: None really.

Marantz MM7055

Crutchfield customer from Bethany, CT on 2/13/2018

Crutchfield Customer Review (What's this?)

Exactly what I was expecting. Quality



Plenty O Clean Power

Les from Studio City, CA on 1/26/2018

Crutchfield Customer Review (What's this?)

Plenty O' Power, clean looks, a die hard Marantz fan. Replaces a 20yr. old Marantz amp.

Pros: Hard to find flaws with power delivery. Nice clean look. Easy Install

Cons: none that I know of

Marantz MM-7055

Carl from Lake mary, FL on 6/22/2017

I have the marantz MM7055 with the marantz AV7702mkII pre, I have used denon and Yamaha , pioneer systems with my klipsch speakers, all of them sound very nice. But now, I'm in a hole other ball park. All my speakers have a min of 99db sensitivity so without saying I don't need 170 watts. The amp sound so clean that without any music playing I can turn it all the way up and I don't hear any hiss out and othe sounds. But when playing the sound is so warm and natural . I am running it in a 7.1.2 setup, the only non klipsch speaker is my center speaker witch is a old Yamaha folded horn 2 way speaker And now my center sound so find in detail. Without saying all the klipsch speakers sound great also. It does not care what I use on it , anything from the PS4, xbox1 blue ray and the kodi box and even over the air tv shows. They all sound great. I was hesitant on spending money on this kind of system but it's been well worth it I should've done this long ago The amp runs cooler then my krell, rotel and the denon amps I have.

Pros: Great warm sound and runs cools Apps for my iPhone to run the system

Cons: Set one day aside to set it up and learn how to use it

New Life into your AV

Jim from Kapowsin WA on 3/31/2017

Crutchfield Customer Review (What's this?)

So I bought this because I just wanted too add a amp to my SR7010 and i wanted it to match and I just love the fact that marantz is a AUDIO brand. Well this guy breathed new life into the 5 much that at reference there is zero distortion and much more clarity to every part of the soundstage. I was STUNNED....for real just speechless. I could not believe the difference. And the build quality is top notch. I feel this can easily compete with McIntosh and I have owned both. If you think your stereo is a amp, it takes the load off the AV processor and gives it new life. You won't be disappointed if you are contact me and I'll buy it . They are that good. And also if you want to add even more channels...I.e Atmos you can piggyback the mm7025 with it. I just can't say enough of how good this really is. You will not be disappointed.....Jim ....Cascade Mountains

Pros: Solid build , toroidal power, 5 channels

Cons: Non I have found

Clean, capable powerhouse

Matt from Croton on Hudson, NY on 2/14/2017

Crutchfield Customer Review (What's this?)

Very capable, clean amp for my 5.2 system.



Marantz MM7055

Ron from Birmingham, AL on 1/22/2017

Crutchfield Customer Review (What's this?)

Driving 4 channels, 2 electrostatic ,2 regular speakers. Using in combination with 8807.Plenty of power / well defined sound/ no obvious distortion.

Pros: Great value for money.

Cons: None

Great power Amp

Irving from Bronx, NY on 12/29/2016

Crutchfield Customer Review (What's this?)

going with A/V separates makes a huge difference in sound and power. I came from an Onkyo 807 7.1 receiver with Def Tech Pro Cinema 800's for about 6 years. I upgraded over the holidays and bought the marantz MM7055 with the marantz AV7702mkII pre-pro and it blew my mind away. This amp powers my Definitive Technology BP-9040 with no issues what so ever. I run a 5.4 system no atmos just five speakers and four subs and I am more than pleased on the clean sound and power from my system. I will never look back. five stars ***** go out to Crutchfield for helping me out thank you

Pros: great performance

Cons: didn't break the bank

good pairing with the 7701

jimmy j from North Carolina on 1/8/2016

Bought the 7055 amp to go with my 7701 pre/pro. Excellent sounding combo. A few months in to my amp purchase it started distorting on some of the channels and then just shut down altogether. I was watching and listening to an F1 race. Can't remember which one. Took it to a local authorized Marantz service depot and about a week later a brand new amp showed up on my door step delivered by a big brown van. I was totally surprised. The second amp works great and has for over a year now. I did manage to drive it to clipping one time and the protection circuit shut it down. It is not a 200 watt per channel amp but it is not advertised as being one. The specs are dumb though with a max amp rating of 2 channels driven (what?'s a 5 channel amp). This setup really sings with Aq Rocket 33 cables and Aerial 5 speakers. If Marantz made a 200watt per channel 5 channel amp, I would buy one in a heartbeat.

Pros: sound

Cons: can run out of steam if driven to hard

Marantz MM7055

Pete V from Michigan on 9/22/2015

Crutchfield Customer Review (What's this?)

Nice powered amp. Using to power high frequency with two channels. And low frequency wit the another set. Really cleaned up my sound and furnished improved detail. Don't think I could have gotten the improvement for this reasonable cost.

Pros: Easy to connect Nice sound Good value

Cons: Documentation unclear Standby power switching a bit useless and not worth it

Under Powered

Patrick P from Virginia on 4/5/2015

Crutchfield Customer Review (What's this?)

I bought the Marantz MM7055 and the AV7701 as my first foray into separates after only having had receivers in the past. This was intended to be an upgrade from my 16 year old Pioneer Elite 5 channel VSX09TX which was 100 watts/channel X 5 channels. I was really hoping the separate power Amp at 140 watts would provide more power to really push my PSB 8 ohm bookshelf speakers. However I found little discernible difference in power from the Marantz Amp to my old pioneer Elite receiver. In fact the Marantz seemed to provide less power until I went into the settings and boosted the front channels to the max setting. With boosting the levels that the combo is acceptable but far below what I expected. I could get the same performance with a receiver and walk away spending $900 less. I was really looking for power and the Amp just doesn't deliver to expectations. Maybe I expected too much at this price. Actually the combo is not bad and the AV 7701 is an EXCELLENT pre-amp. Set up was a breeze, it converts digital internet music beautifully, everything sounds clear and clean and it's fairly easy and intuitive to figure it out. So this combo might be good for many people especially if movies is your main thing, you've got a relatively small space and are comfortable with modest power. I will be testing out Crutchfield's return policy and will order another Pioneer Elite receiver since I had good success with my previous one. Then I'll add a 200 watt amp just for front Ch.

Pros: Nice Clean Sound

Cons: Under Powered


bob m. from New York on 12/13/2014

Crutchfield Customer Review (What's this?)

I have found the 7705 5 channel amp . to be a very good match for my av7005 pre amp !! very happy !!!



Deep, Relaxed Power Reserves

Crutchfield customer from Idaho on 3/8/2014

Crutchfield Customer Review (What's this?)

Movies' biggest challenge for sound systems seems to be their wide dynamic range. I have owned 75W/ch & 100W/ch systems, and with each step up have found the movie watching experience to be transformed. But no previous systems prepared me for this upgrade. I am a fan of Marantz sound, a slightly warm but very precise and musical output. Marantz somehow manages the precision of digital components without the tiring, metallic effects of many other amps. I wanted the power of this amp for dynamic surges in music and special effects, and I wanted that range without giving up the nuance of dialogue and acoustic music in soundtracks. This amp delivers. Since the size of this amp is significant, and it requires a separate pre-amp, I might add that the styling is also appealing.

Pros: Relaxed, plentiful power reserves. Clean but non-metallic sound. Cool look. DLR and RCA connections.

Cons: Nada.

A step up.

T.H. from Arkansas on 11/25/2013

Crutchfield Customer Review (What's this?)

I use my home theater system every day, so I feel like I get more bang per buck out of the money I spend on it than with other things I spend money on. I replaced a 600 series Onkyo a/v receiver with this Marantz MM7055 amplifier and the Marantz SR7005 preamp. I'm not an audiophile, but one thing I've learned over the years is that watts matter when powering speakers. The 90 watt Onkyo sounded fine for most tv viewing on my 5.1 surround system, but the extra watts as well as the fine engineering of this Marantz system produced a really powerful and enveloping sound I didn't get with the Onkyo 600 series.Blu-ray audio is a real treat on the Marantz system. I did also get to listen to an 800 series Onkyo a/v receiver, and it's extra watts made up a lot of ground sound-wise on the Marantz system for a lot less money. However, I felt like the Marantz had a small advantage in terms of an effortless, non-fatigueing sound at higher volumes over the Onkyo 800 series. The Onkyo 800 series is a steal at its price, but the Marantz system looks and sounds like a work of art, so I decided to take the plunge and have no regrets.



Good amp, good power

SleeplessNJ from White House Station, NJ on 4/20/2013

Crutchfield Customer Review (What's this?)

Got this with the 7701, upgrading from a receiver with less power. (Lucked out and got both at open box price.) The amp does seem to match its rated 5 channel power, many amps I've seen or tried recently appear to suffer from inflated power ratings, but not this one. My speakers are pretty efficient, so this drives them to sufficiently brain-rattling volumes for space opera videos, or for listening to music. My test is symphonic music - the more complex and dense the sounds, the more you can show an amp's weaknesses, and this does a fine job, no muddling, every instrument clear, decent imaging. I got this as a price-driven compromise, figuring I'd upgrade it in the future if it wasn't everything I wanted, and that will probably happen in a year or two. I compared this amp to my high end amp (using the 7701 as pre-amp in each case) for stereo audio and the 7055 didn't have as much sound stage depth and breadth, which is what I'd have expected for an amp that's about 1/8 the price. Note it's NOT 1/8 the sound quality - compared to another amp I use in my studio audio system, priced a bit higher than the 7055 and only two channels, the 7055 is a better sounding in terms of detail and imaging. It beats daylights out of the receiver (which cost about the same as just this amp alone) that the Marantz combo replaced, in clarity, slam, and imaging. Night and day. And once you've got five speakers hooked up, 2 speaker imaging isn't so important.

Pros: Good price, honest power, good sound quality five channels

Cons: Big

Well worth adding to the system

Carole from New Mexico on 12/16/2012

Crutchfield Customer Review (What's this?)

This amp was added between our Marantz SR7005 A/V rcvr and our Polk RTi, CSi, and F/Xi speakers. The home theater was already great, but when we added this amp, it got even better. We had enough power without the amp, but the increased headroom and range does improve the sound in our room. We don't have close neighbors and don't use dynamic volume or dynamic EQ, so we can really enjoy this thing. Holy Hi-Fi, Batman! We watched The Dark Knight Rises and were so impressed, we had to send you this review. And, as always, we appreciate the information on your website, efficient order process, and reliable delivery.

Pros: Matches our other Marantz components. Remote control from the receiver. Outstanding value for the performance increase of our system.

Cons: None.


Hands-on research

Product Research


Current Feedback: The MM7055 is equipped with a current feedback circuit and uses the same complimentary push-pull circuit as the far more expensive SM-11S1 power amp, providing minimal phase shift and excellent detail resolution. The current/voltage conversion section has a Wilson current mirror circuit to improve circuit stability and high-speed processing.

Instant Power Supply: The final stage of the power amp uses the same LAPT (high efficiency power transistor) as the SM-11S1, offering instant power supply capability. The power section has a large transformer and Marantz original 33,000 μF / 71 V x 2 block condensers to provide a powerful, presence filled sound.

Heat Dissipation: The chimney-shaped heat sink efficiently processes the heat emitted from the amp and a quiet cooling fan removes the heat from the chassis. A high-sensitivity temperature sensor IC is used to control the cooling fan's rotation speed to match the amount of heat generated by the amp.

Auto Standby: With the Auto Standby Mode is turned on this unit will enter standby mode after approximately 30 minutes (continuous) with no input signal.

Speaker Outputs: The five speaker output terminals are binding posts; they are not 5-way posts, but will accept single banana plugs, pin connectors, and bare wire. A plastic collar prevents their use with spade lugs and they're too far apart for dual banana plugs.

Inputs: Each channel has an RCA (unbalanced) and XLR (balanced) input. Separate switches for each channel specifies which is engaged.

Display: A blue indicator on the front panel display and a blue ring around the display light when the power is on; the blue ring around the display can be turned off if you prefer. Separate red indicators on the display light when the protection circuit or Auto Standby feature is engaged.

Remote Power Control: This unit is equipped with a remote power control function; when a compatible Marantz preamp is connected, this unit's power can be switched on and off simultaneously with the preamp. The RCA Remote Control input is connected to the preamp and the Remote Control output can be connected to other compatible Marantz components; CD player, DVD player, Tuner, etc.

Flasher Input: The IR flasher input is useful with universal remote controls; power and mute remote codes are available for the MM7055.

DC Control: The 3.5mm mini-jack input allows the MM7055's power to be controlled by another device (5-15 V). The DC Control output allows the MM7055 to control the power of another compatible device (12 V/44 mA).


  • Power: (20 Hz-20 kHz, 0.08% THD, two channels driven simultaneously)
    • 8 Ω: 140 watts x 5
    • 6Ω: 170 watts x 5
  • Input Sensitivity:
    • RCA: 1.2 V/22 kΩ
    • XLR: 2.4 V/30 kΩ
  • Signal to Noise Ratio: 105 dB
  • Power Consumption: 660 watts
  • Standby Power: 0.2 watts
  • Weight: 34.6 pounds

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.