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NAD Masters Series M25

7-channel power amplifier

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  • NAD Masters Series M25

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  • NAD Masters Series M25

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Item #: 745M25
 

Review Summary

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Our take on the NAD Masters Series M25

by Jim Richardson
NAD

7 channels of massive power meet the demands of today's toughest soundtracks

To get the most out of the advanced soundtracks on most Blu-ray discs, you need serious power on every channel. The M25, at 160-watts times seven channels, is one of the most powerful home theater amplifiers built today. The perfect complement to NAD's M15 HD preamp/processor, the M25 easily exceeds THX's most stringent Ultra 2 certification requirements, guaranteeing first-rate performance.

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The M25 contains seven individual mono block amplifiers, with each channel using a balanced junction FET input stage to eliminate cross-talk, resulting in exceptionally low levels of noise and distortion. NAD employs a unique electronic ground isolation circuit to prevent ground loop noise, a common problem with many complex multi-channel systems.

Intelligent features ensure clean, dynamic sound

NAD's proprietary PowerDrive™ circuitry measures each channel's dynamic impedance individually and computes the optimum power supply voltage required to drive the output stage for maximum power and efficiency. The M25 also incorporates NAD's acclaimed switchable "Soft Clipping®" circuit, which gently transforms the audio waveform as the point of clipping distortion approaches to keep the sound clean and your speakers protected.

The M25 can deliver its full rated power continuously for hours on end. Custom designed heat sinks and variable-speed fans work to keep the M25 running cool under the most severe conditions. A unique circuit that tracks signal level actually shuts down the fans during quiet passages.

Quality in every detail

back panel

The M25 utilizes NAD's proven Holmgren Toroidal transformer design to create a power supply that offers well regulated voltage, massive current and low noise. Multiple high-grade capacitors ensure a clean DC voltage supply for very low noise and explosive dynamics. Copper buss bars are used exclusively throughout for power delivery and grounding.

Buffered low-impedance level controls allow system fine tuning without the distortion typical of most level control circuits. Custom-designed, gold-plated speaker binding posts offer multiple connector options, while maintaining a large, corrosion-free, low-impedance contact area.

Highlights:

  • 7-channel THX Ultra 2 Certified power amplifier
  • 160 watts per channel into 8 ohms (20-20 kHz at 0.03% THD)
  • NAD Soft Clipping™ technology
  • PowerDrive™ circuitry
  • each channel has individual over-current, DC, infrasonic and ultrasonic overload sensing and protection for complete reliability under even the most severe operating conditions
  • signal-to-noise ratio: 118 dB
  • one RCA input for each channel
  • 12-volt DC trigger input
  • massive Holmgren toroidal power transformer
  • gold-plated binding post speaker terminals
  • 1 switched AC outlet
  • detachable power cord
  • weight: 116 lbs.
  • 17-1/8"W x 8-3/8"H x 20-1/2"D
  • 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 7
Power Output per Channel (8 ohms) 160
Power Output per Channel (6 ohms) ---
Power Output per Channel (4 ohms) 160
Frequency Response 3-70k
THD 0.03%
Bridged Power per Channel N/A
Speaker Outputs 7
THX Certification Yes
Width (inches) 17-1/8
Height (inches) 8-3/8
Depth (inches) 20-1/2
Weight 96.3 pounds
Parts Warranty 3 Years
Labor Warranty 3 Years
Inputs & Outputs
Number of Inputs 7
Level Controls Yes
Speaker Connectors Binding posts
Product Research
What's in the box?

Download owner's manual

  • 7-channel amplifier
  • 76" Power cord
  • Owner's manual (English/ French/ German/ Dutch/ Spanish/ Italian/ Portuguese/ Swedish)
  • Heat warning
  • 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
Controls
Connections
Specifications

Features

Overview: The M25 is seven individual mono block amplifiers in one chassis, each using a balanced junction FET input stage to eliminate cross-talk, resulting in exceptionally low levels of noise and distortion. The power rating of 160 watts (continuous) x 7 is taken with all channels driven simultaneously into a 4Ω or 8Ω load, from 20Hz to 20kHz, at the rated distortion of 0.03%. The M25 can deliver its full-rated power for long periods; custom heat sinks and temperature regulated, variable speed cooling fans work to keep the amp running cool under the most extreme conditions. The M25 utilizes NAD's Holmgren Toroidal transformer design, in a massive size, to create a power supply that offers very well regulated voltage, and large quantities of current. The transformer design utilizes proprietary low leakage field technology which is very low in both electrical noise (stray field) and physical noise (buzz). NAD also uses an electronic ground isolation circuit to prevent ground loop noise in the system, a common problem with many complex multi-channel systems. The M25 delivers lifelike sound levels even in large home theaters; it meets THX's most stringent Ultra 2 certification level.

PowerDrive: NAD's PowerDrive technology measures each channel's dynamic impedance individually and computes the optimum power supply voltage required to drive the output stage for maximum power and efficiency.

Soft Clipping: NAD's Soft Clipping circuit gently limits the output of the M25 to minimize audible distortion when the amplifier is over-driven. Each channel is individually protected and has its own front panel LED, which turns red when the circuit engages. While Soft Clipping can be left on at all times to reduce the likelihood of audible distortion from excessive volume settings, you can also turn the circuit off for critical listening if you prefer.

Input Level: The amplifier is equipped with separate input level controls for each channel. At the full clockwise position the gain conforms to THX Ultra2 standards. Adjusting the levels may be necessary when using speakers of different efficiencies or to extend the volume control range of the preamp.

Turn-on Trigger: The M25 can be turned on automatically using the 3.5mm +12 volt trigger input on the rear panel.

Controls

Front Panel:

  • Power: toggle between power on and standby

Rear Panel:

  • Level: each channel has a rotary input level knob
  • Soft Clipping: on/off
  • 12 Volt Trigger: on/off

Connections

Rear Panel:

  • Speakers: the seven pair of speaker binding posts will accept single banana plugs, pin connectors, spade lugs up to 0.48" wide, and bare wire up to 10 gauge
  • Inputs: each channel has a single RCA input
  • 12 Volt Trigger Input: 3.5mm mini-jack; turn the amp on/off along with another component
  • Ground: terminal for grounding the chassis of the amp
  • AC Input: 3-pole IEC power input for use with included cord (or optional upgraded cord)

Specifications

Amplifier Section:

  • Continuous Power: 160 watts x 7 into an 8Ω or 4Ω load, 20 Hz - 20 kHz, no more than 0.03% THD, all channels driven simultaneously
  • Dynamic Power:
    • 8Ω: 220 watts x 7
    • 4Ω: 350 watts x 7
    • 2Ω: 460 watts x 7
  • Rated Distortion: 0.03% (20 Hz - 20 kHz)
  • Signal/Noise:
    • >96 dB (ref 1 watt)
    • >118 dB (ref 160 watt)
  • Damping factor: >180 (ref 8Ω, 50 Hz)
  • Frequency Response:
    • +/- 0.02 dB: 20 Hz-20 kHz
    • - 3 dB: 3 Hz-70 kHz
  • Input impedance: 1 MΩ + 180 pF
  • Input sensitivity: 1.25 volts (+/- 50mV at rated power into 8Ω)
  • Voltage gain: 29 dB
  • Power Requirement: AC 120V 60Hz
  • Weight: 96.3 lbs (43.7 kg)
 
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NAD Masters Series M25 Reviews

Average Customer Review:

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5 out of 5

Powerful and Detailed

Written By gmandrummer, Dallas, TX on Monday, June 27, 2011
 
The M25 is more than I expected, even after all the fantastic reviews, I listen to a lot of 2 channel music as well as Blue Ray discs, and Concerts on DVD. The M25 has plenty of reserve power when called upon, but with a very low noise floor you hear everything. My music never sounded so good. There is now lots of low level detail. You will be amazed!! When watching action packed movies on Blue Ray, you would think that you are there. I will have this peice of equipment for some time to come. The "Best Value" for the money.
26 out of 26 people found this helpful
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5 out of 5

Awesome! Clean and Detailed Sound

Written By Terry R, E Peoria, IL on Tuesday, January 18, 2011
Crutchfield Customer Review (What's this?)
 
Purchased the M25 about a month ago. Was using an high-end Receiver (145w/ch) to power my B & W 800 series speakers. Wasn't sure if I would hear a huge difference between that and the NAD, but what a surprise! OMG!

The NAD is bringing out detail in the music that I didn't hear before. VERY CLEAN and accurate. Bass is tight, with lots of headroom. I spend even more time listening to my system now. The sound draws you in and keeps you there for hours.

Very happy with my purchase. Been a Crutchfield customer for 10+ years and have never been disappointed w/ any product or service. You guys are great! Thanks!
24 out of 24 people found this helpful
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