5-channel power amplifier
Our take on the Marantz MM7055 by Crutchfield's Jim Richardson
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.
- 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
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Features and Specs
|Number of Channels||5|
|Power Output per Channel (8 ohms)||140|
|Power Output per Channel (6 ohms)||170|
|Power Output per Channel (4 ohms)||---|
|Bridged Power per Channel||N/A|
|Parts Warranty||3 Years|
|Labor Warranty||3 Years|
|Inputs & Outputs|
|Number of Inputs||5|
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
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Why did you buy this?
Reasonable priced [ Michael Mar 12, 2018 ]
Love Marantz and it replaces a 20yr. old Marantz amp. [ les Jan 12, 2018 ]
Quality [ lawrence Mar 26, 2016 ]
7 questions already asked
I have this powering a pair of LSiM 707 towers, LSiM 706c, and a pair of LSiM 703 surrounds. PLENTY of power to get the job done, with ample room to go more. Never had any problems, though I've only been using it for a little over 2 months. [ Jonathan Mar 25, 2018 ]
The Polks are relatively efficient speakers (90db @1w). The Marantz amp has plenty of power (realistically 100w RMS/ch x 5). So unless you plan to drive the speakers to ear shattering levels, I would not hesitate to pair the Marantz with the Polks. Enjoy! [ Douglas Mar 25, 2018 ]
My sub is powered so I kept it connected to the receiver I have. [ TYRONE Nov 07, 2017 ]
Powered sub is connected from the pre amp, 7005 in my case. system works well. [ Helen Nov 06, 2017 ]
You will connect your powered sub(s) to your pre-amp/processor - and then your fronts, center and rears are powered by this amplifier. [ MATTHEW Nov 06, 2017 ]
In my configuaration I'm running the sub off of the receiver/processor not the amp. But that means my receiver is powered - yours may not [ neal Nov 06, 2017 ]
I signal my sub through my SR6010. Use the 7055 to power all speakers in a 7.1 system other than the fronts, in which I rely on the 7025. Sweet set up, perfect for me and my wife! Good luck and if you have any other questions, please ask! [ SONYA Nov 06, 2017 ]
This is an additional response to my first. I'm guessing you have some really nice speakers at 4 ohms you don't. want to part with. I get that but they are unusual. I have a pair of Polk LSi25's that are at 4 ohms. I use a couple of old DENON mono blocks that are like 25+ years old since they are very stable at the low impedance. You can look for an old solid state amplifier on like ebay for something like that as most of the modern amps don't go below 6 ohm in there specs.If you find one you may consider having the capacitors replaced to give it optimal performace as they where down over time. Not to expensive to do if you can make you way with a soldering iron. The other option is to go for a tube amp. Tube amps love the low impedance and perform well in this environment. They can get a bit expensive but the sound is very warm. If I could afford one now I would get one myself. Just some additional options. I use the 7055 to power my home theater with Klipsh speakers 2 of which are 25+ years old as well but they run at 8 ohms and 99 db. [ David May 17, 2017 ]
A quick look at the 7055 owners manual - available on the Marantz website would raise concerns about using this amp with 4ohm loads. The specs only go down to 6ohm loads. You might consider doing a search for audiophile reviews of the amp that would provide a more comprehensive analysis of the loads this amp is capable of driving without problems. [ Douglas May 17, 2017 ]
As far as I know its stable down to a 6 ohm load. It can likely handle a 4 ohm load but could possibly put a bit of stress on the amp and over time if you push it hard could wind up damaging the output power transistors. If you try I would get a an extended warranty on it in this case. [ David May 17, 2017 ]
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 away.so 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 ]