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Crutchfield

Marantz MM7025

Stereo power amplifier

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  • Marantz MM7025

    Front

  • Marantz MM7025

    Rear panel

  • Marantz MM7025

    Rear panel, angled view

 

Our take on the Marantz MM7025

by Jim Richardson
Marantz

Massive power for a wide range of audio applications

Connect this 2 x 140-watt beast to the preamp outputs of a receiver or a wireless music player such as the the Sonos ZP90. Add a pair of speakers that can handle the high power, and get ready for a breathtaking sonic thrill ride.

Use the MM7025 in your main listening room to drive your primary speakers. Expect to hear tighter, weightier bass, and wider dynamic swings that bring you closer to the sound of live music. (If your speakers can be biamped, this Marantz makes a superb choice for driving the low-frequency half of your system.)

Audiophiles using a preamp or A/V processor with XLR outputs can connect to this amp's XLR inputs and take advantage of the superior sound quality they provide. You could also use this amp to power a second zone. If you're using a speaker selector to divide the second-zone power among multiple rooms, don't worry. There's plenty of juice here to go around.

The MM7025's current-feedback amplifier design provides for nuanced reproduction of fine musical detail and plenty of sonic muscle to support chest-thumping transient peaks. HDAM-SA3 circuits provide high-speed signal response for precise sound.

Highlights:

  • 2-channel power amplifier
  • 140 watts x 2 into 8 ohms (20-20 kHz at 0.08% THD); 170 watts x 2 into 6 ohms
  • frequency response: 8-100,000 Hz (±3 dB)
  • signal-to-noise ratio: 105 dB
  • Discrete Current Feedback circuit for accurate, natural sound at all volume levels
  • oversized power transformer for high current levels
  • one RCA and one XLR input for each channel
  • DC trigger input/output
  • IR flasher input
  • gold-plated binding post speaker terminals
  • detachable power cord
  • 17-3/8"W x 5"H x 15"D
  • weight: 23.8 lbs.
  • warranty: 3 years
  • Our 60-day money-back guarantee
 

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
General
Number of Channels
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2
Power Output per Channel (8 ohms)
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140
Power Output per Channel (6 ohms)
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170
Power Output per Channel (4 ohms)
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---
Frequency Response
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8-100k
THD
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0.08%
Bridged Power per Channel
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N/A
Speaker Outputs
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2
THX Certification
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No
Width (inches)
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17-3/8
Height (inches)
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5-1/16
Depth (inches)
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15
Weight
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23.8 pounds
Parts Warranty
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3 Years
Labor Warranty
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3 Years
Inputs & Outputs
Number of Inputs
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2
Level Controls
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No
Speaker Connectors
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Posts
Product Research
What's in the box?

Download owner's manual

  • 2-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

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.

Features

Current Feedback: The MM7025 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 15,000 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 each side of 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 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: There are RCA (unbalanced) and XLR (balanced) inputs. Separate switches for the left and right channels specify which is engaged; useful if you're not using the MM7025 as a stereo amp.

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 MM7025.

DC Control: The 3.5mm mini-jack input allows the MM7025's power to be controlled by another device (5-15 V). The DC Control output allows the MM7025 to control the power of another compatible device (12 V/44 mA).

Specifications:

  • Amplifier Type: Class AB
  • Power: (20 Hz-20 kHz, 0.08% THD, both channels driven)
    • 8 Ω: 140 watts x 2
    • 6 Ω: 170 watts x 2
  • Input Sensitivity:
    • RCA: 1.2 V/22 kΩ
    • XLR: 2.4 V/30 kΩ
  • Signal to Noise Ratio: 105 dB
  • Power Consumption: 330 watts
  • Standby Power: 0.2 watts
  • Weight: 23.8 pounds
 
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Marantz MM7025 Reviews

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Filter by rating:
5 out of 5

Good Sound & Good Looks!

Written By jd, SW Missouri on Tuesday, February 04, 2014
Crutchfield Customer Review (What's this?)
 
I have been using this amp with a Marantz NR1602 receiver to drive my Bose 901 VI loudspeakers. It does this quite well. Previously, I used an Adcom GFA5500, which is a much heavier amp, rated 200W per channel into 8 Ohms and 350W / channel into 4 Ohms compared to the Marantz's 140/170 Watt ratings. Despite the power deficit, the Marantz sounds real nice with the 901's and seems to be stout enough for them. Admittedly, the 901's, even considering their EQ, are an easy load as they are fairly sensitive and present a uniformly comfortable impedance.

The MM7025 is very quiet in operation. It has a cooling fan but I have yet to hear it come on. I hear no noise at all with this amp.

Music, TV and movies just sound natural with the MM7025. It's pretty much a case of what goes in is what comes out. It seems to add no color or character of it's own. In my mind, that is exactly what an audio amplifier should do.

The only thing that I've found so far to give Marantz a slight demerit for is the auto-off circuit. It works fine to automatically power down the amp after a pre-set inactive period, but it's not so good at turning it back on! I have to cycle the receiver's power off, then back on, to wake up the MM7025. No biggie, I just use my receivers sleep function. When it sleeps, so does the amp. Then when I turn the receiver on, the remote connection wakes the amp.
Pros:
Beautiful looks! (If you appreciate such things!) Quiet operation Neutral sound Manageable size Fair price Good power
Cons:
Not rated for 4 Ohm loads Auto power off circuit could be improved by including a signal-sensing function.
3 out of 4 people found this helpful
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5 out of 5

Marantz MM7025

Written By Anonymous, Akron, Ohio on Friday, December 27, 2013
Crutchfield Customer Review (What's this?)
 
I got this to use for the left & right main channels of my Marantz SR7005 receiver. I'm very happy with the results. I think the MM7025 does a better job driving the B&W 604 speakers. The remote control connection to the reciever is nice. The amp starts up a few seconds after the receiver is turned on.
Pros:
Nice sounding amp.
Cons:
None
5 out of 5 people found this helpful
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5 out of 5

Great Amplifier

Written By TeddD, Elkhorn, Ne on Friday, August 16, 2013
Crutchfield Customer Review (What's this?)
 
Using Arcam DAC into Marantz AV7005 to the MM7025, which is then driving B&W PM1s. Replaced a Yamaha receiver with about the same power. The difference is stunning, even the wife, who never listens was immediately captivated. Depth, clarity, power all great. No hard edges to the sound like some other amps I looked at. Really woke up the PM1s.
Pros:
Depth, clarity big improvement. Looks match the AV7005 and are nice. Used banana plugs for out and XLR balanced connections for in, which worked great.
Cons:
Nothing really.
11 out of 12 people found this helpful
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5 out of 5

Great Marantz 2 channel MM7025!

Written By B. Vincent, New York, NY on Wednesday, May 22, 2013
Crutchfield Customer Review (What's this?)
 
Great sound for 2 channels. Has power and impact to spare. Once it was connected, not easy with only bare wires, worked like a champ! A high end value!
Pros:
Great sound. Very nice looks.
Cons:
Limited connectivity. Ruins wire with spade ends.
3 out of 5 people found this helpful
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5 out of 5

Excellent

Written By Tom, Catlettsburg, KY on Saturday, October 13, 2012
Crutchfield Customer Review (What's this?)
 
Excellent. Paired with a Peachtree Audio Nova Pre and pushing B&W 683s. Large presence at low volumes. HUGE presence as volume increases. Dead quiet to control chaos depending on the track. Using computer USB, Digital coaxial from CD player and Optical from an Apple Airport Express to stream. Would be the same combo again.
10 out of 13 people found this helpful
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2 questions already asked

I am going to us this with a older model sony reciver M#strde885 with a subwoffer and a pair of klips towers I all ready get a 100 watts per channel but am looking to get clean and clear sound ,my question is will the amp make much of a difference? Dan C [ D  Feb 05, 2014 ]
1 answer
  • It depends on how hard you push the Klipsch now and how stout a 100W the Sony receiver is. Most A/V receivers, especially towards the lower end of the market, can't deliver anything like their rated power to all channels simultaneously. The Klipsch should be a relatively easy load, though, so unless you're really rockin', your Sony receiver should have enough power to drive them easily -for stereo music that is. If you like to crank up action flicks, putting an amp like the Marantz on the front channels will really lighten the load on your receiver. And even for stereo music listening, if you like the bass and like to listen at life-like levels, the bigger, beefier amp will definitely do a better job. [ JAMES   Feb 06, 2014 ]
Does this amplifier have a cooling fan? If so, how loud is the fan? I may be sitting within 6 feet of the amplifier. I don't want to hear the fan during the quiet intervals. [ Larry Sacks  Jan 11, 2014 ]
3 answers
  • Appreciate the clear and interesting answer. Thank you for taking the time to reply and to educate me. [ Larry Sacks   Jan 13, 2014 ]
  • Have never heard the fan. It does have one. [ NORMAN T   Jan 11, 2014 ]
  • It does have a cooling fan. It's speed is matched to the amount of heat that is being generated. I have had this amp for over a year, use it almost daily and have never heard the fan run. This amp has a very low operating temperature. [ KEN   Jan 11, 2014 ]

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