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Marantz MM7055

5-channel power amplifier

Item #: 642MM7055

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8 Reviews | 4 questions - 17 answers

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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

Marantz MM7055 Reviews

Average Customer Review:

8 Reviews

good pairing with the 7701

Written by: jimmy j from North Carolina on January 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

Written by: Pete V from Michigan on September 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

Written by: Patrick P from Virginia on April 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


Written by: bob m. from New York on December 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

Written by: Anonymous from Idaho on March 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.

Written by: T.H. from Arkansas on November 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

Written by: SleeplessNJ from White House Station, NJ on April 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

Written by: Carole from New Mexico on December 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

What's in the box?

Download owner's manual

  • 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

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.

Customer Q&A

4 questions already asked

You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility. They will be able to pull up your equipment and see if this will integrate. If it does not, then they will also be able to discuss other options with you. [ Kenny  Jan 30, 2016 ]  Staff
I Don't know, but crutchfield should. [ Keith W.  Jan 30, 2016 ]
YEs! As long as the receiver has pre outs ! Your receiver will act as a pre amp !!ddd Yes !! If your receiver has pre outs ! I believe yours does. [ robert  Dec 27, 2015 ]
Your receiver will need to have pre-amp outputs and it will work. I found this amp to be on the weak side was not as powerful as I expected. Depending g on your needs you might just consider upgrading your receiver to a new Marantz receiver with the latest technology and will drive your speakers just as good as this amp will [ PATRICK  Dec 26, 2015 ]
I have the Marantz AV7702 pre-amp and I am able to power up this amp using the cable supplied by Marantz. [ BRIAN  Mar 14, 2015 ]
No, a pre amp signal will not power on the amplifier. The amp does have a remote power on switch. [ JAMES  Mar 13, 2015 ]
No, not that I know of. You must switch on the power amp manually. [ GEORGE  Mar 13, 2015 ]
No [ Milton  Mar 12, 2015 ]
first time i am turn on then automatic off right i just takeout for until now. never use it. thanks. anh. [ ANH  Mar 12, 2015 ]
Yes it will. That is how I have mine configured,. [ CHRISTOPHER  Mar 12, 2015 ]
I am not sure. I have four of them, and there is some kind of trigger feature which allows me to turn them all off by simply hitting one button. My system was put together by a professional, I pretty much just listen to it. [ VINCENT JAME  Mar 12, 2015 ]
Yes. I have a Marantz pre-tuner that powers it on. [ Andy  Mar 12, 2015 ]
Yes it will. I power up both a MM7055 and an MM7025 with mine. [ LAWRENCE  Mar 12, 2015 ]
if your receiver has pre outs on the back ? then yes ! your receiver would then act as a pre amp . All your power would come from the mm7055 and would be a significant upgrade ! hope i helped ! [ robert  Jan 05, 2015 ]
As you are aware, this is the SR 7007 A/V receiver and not a pre amp/processor? And this application will work as well with the MM7055? [ Michael  Jan 05, 2015 ]
Yes, Yes, a thousand times yes. The signal voltage levels used by preamp/processor/power amp manufacturs has been consistant for decades. There may be a few weird exections out there, but almost any preamp/processor and almost any power amp will work just fine with each other. In my recent experience, a Marantz AV7701 preamp/processor woks equally well with a modern Marantz MM7055 5ch power amp as it does with 30 year old Crown PS 200/400 amps. One caveat to watch out for is the polarity of the XLR connectors, if you use them, Marantz uses the Euro standard while others may use the American standard. Recent Marantz produducts will certainly be compatable with each other. In short, the inerface between preamps/processors and power amps is almost like USB....just p;ug them in and they willl work, regardless of the respective manufacturers. [ Matthew  Jan 05, 2015 ]
It could be use with any preamp. Have RCA & balance input. [ Milton  Jan 04, 2015 ]