NAD M28 Master Series Seven Channel Power Amplifier

The Ultimate in Today's Amplifier Technology

NAD's Masters M28 Seven-Channel Power Amplifier epitomizes the ultimate in what is possible with today's amplification technology. It is one of the very first amplifiers to employ Purifi’s Eigentakt™ amplifier technology.

Rated conservatively at 200W per channel (8 ohms) and well over 320W dynamic power (8 ohms, all channels driven), the result is breath-taking, lifelike surround sound performance, be it from the latest action-packed film with tremendous dynamics or a subtle classical piece with delicate and detailed passages. The M28 can accept both balanced and single-ended inputs, and it features high-quality binding posts for speaker connection. The compact dimensions of this highly energy-efficient design belie the massive amount of power available for the most demanding music and movies.

Effortless Power

As NAD's most powerful amplifier ever, the M28 can pump out over 700W into difficult loads to follow complex dynamic peaks in your movies and music. Everything from rim shots to asteroid explosions sound remarkably real and immersive.

The M28 has power reserves to meet the demands of the latest high-resolution digital soundtracks. Thanks to the advanced Purifi Eigentakt™ amplifier technology, all this monster power comes at a lot less cost than traditional technology and delivers more power and performance.

Purifi Eigentakt Amplification

The Masters M28 uses Eigentakt™ amplifier technology, manufactured by NAD in license from Purifi. This new technology, which NAD was the first to embrace for the M33 Masters Series Streaming Amplifier, adds another level of precision by taking into account previously unknown effects of the output filter in the feedback loop and further refinement of the self-oscillating Class D technology as used by previous NAD Hybrid Digital designs. The result is a performance level that approaches the theoretical limit in measured performance, whether at whispering levels or at full power.

In common with the previous generations of NAD Hybrid Digital technology, but unlike most class D amplifier designs, the M28 is impervious to the loudspeaker load it is presented with, maintaining the same wide and even bandwidth response irrespective of the speaker’s impedance and at the same time providing high current capability. The continuous 200W into 8 ohms on tap for all channels driven at the same time and 700W dynamic power into 4 ohms is testament to this.

Inherent to the Eigentakt™ technology is its very analog-like behavior in the unlikely event the amplifier is driven into clipping. While many class D designs can become unstable, Eigentakt™ behaves in a way similar to the benign way of clipping with instant recovery of well executed traditional class A/B amplifiers.

The sonic character of the M28 only reinforces the story told by the numbers. This is an amazingly powerful and transparent amplifier bringing new levels of refinement and dynamics at any level.

Fully Balanced Audio

The same efficient audio interface used by studios provides the highest level of signal integrity with the lowest noise floor. Locking connectors and special interface electronics allow long cable runs without noise pickup or signal loss. All you get is awesome sound without the possibility of noise pickup or interference.

Product Features

HybridDigital™ Purifi Eigentakt™ Seven-Channel Amplifier
FTC Power: 220W in 8 Ohms, 400W into 4 Ohms
Rated Power: 200W into 8 Ohms, 340W into 4 Ohms
Dynamic Power: 280W into 8 Ohms, 560W into 4 Ohms
Balanced Line Inputs
Single-ended Line Inputs
12V Trigger in
Auto Turn-on
Ground Lug
Detachable AC Power Cord

Product Specs

FTC power, two channels: 220 W (ref. rated THD, 8 Ohms , 20 Hz - 20 kHz, two channels driven); ≥400 W (ref. rated THD, 4 Ohms , 20 Hz - 20 kHz, two channels driven)
Rated power, all channels: ≥ 200 W (ref. rated THD, 8 Ohms , 20 Hz - 20 kHz, all channels driven)≥ 340 W (ref. rated THD, 4 Ohms , 20 Hz - 20 kHz, all channels driven)
Rated THD (250 mW to rated power, CCIF IMD, DIM 100): ≤0.003 % (ref. 20 Hz - 20 kHz)
IHF dynamic power: 280 W 8 Ohms, (all channels driven); 560 W 4 Ohms, (one channel driven)
Damping factor: > 750 (ref. 8 Ohms, 50 Hz and 1 kHz)
Input sensitivity: 1.3 V (ref. rated power)
Input impedance: 47 kΩ (Balanced)
Input Impedance (r and c): 23 kΩ (Single-ended)
Signal-to-noise ratio: >102dB (A-weighted ref. 1W, Balanced); >97 dB (A-weighted ref. 1W, Single-ended); > 124 dB (A-weighted ref. rated power, Balanced); > 120 dB (A-weighted ref. rated power, Single-ended)
Frequency response: ± 0.1 dB (ref. 20 Hz - 20 kHz); -3 dB at 3 Hz to 60 kHz
Standby power: ≤ 0.5W
Dimensions: 17-3/16" x 6-3/16" x 15”
Weight: 46.7 lbs.

Product Warranty

2 Years

Parts & Labor

NAD Electronics Warranty Information

Product Manual

	NAD M28 Owner's Manual (PDF Format)

	NAD M28 Quick Setup Guide (PDF Format)

	NAD M28 Data Sheet (PDF Format)

2022 Recommended Components - Stereophile

"With the NAD amp in place, I felt that there was a more satisfying integration of the soundfield than before. At first, I thought this was simply due to the smoothness and transparency of the M28. Even in non-bass-managed stereo, it sounded a little bit different from the Bryston: The treble seemed more delicately detailed while the upper low frequencies were a bit better defined. In multichannel, the M28 created a somewhat greater sense of envelopment with both 5.1 and Atmos content."

"The NAD M28 is now resident in my system. It is nearly half the weight and draws half the power at idle as its predecessor, but I foresee it remaining there for just as long."

- Kal Rubinson, Stereophile, May 21, 2021

2021 Secrets Best of Awards - Best Multichannel Power Amplifier

"The NAD Masters M28 Seven Channel Amplifier is a cut above the rest. I am a fan of forward presentation and powerful Class AB amps usually provide that. Class D units aren’t as much in my face, but they are always clean and accurate. The M28 is a Class D product that takes unfailing accuracy and neutrality and combines it with character."

"That’s an important distinction for me and it’s one that not only impresses but creates desire. Just as fine food makes you want to eat more, or fine art rivets your attention (if you’ve ever seen an original Vermeer painting, you know what I mean), the M28 makes you want to keep listening. It enhances movie soundtracks with impact and detail. It makes music sound…well, musical. And regardless of the set volume, it performs flawlessly. Soft passages come through with delicacy while loud material stays clean and clear. And through it all, the M28 never breaks a sweat. It doesn’t even get warm."

"...the NAD M28 Seven Channel Power Amplifier is a premium product, but, in my experience, it is a tremendous value. It receives my highest recommendation."

"It may be the last multi-channel amplifier you’ll ever buy."

- Chris Eberle, Secrets of Home Theater and High Fidelity, April 5, 2021

"The M28 reproduced well-recorded voices with amazing accuracy and presence in general, but was also able to do the same with the instruments in Del Rey’s 'Venice Bitch.' Whether it was the softly strummed guitar in the foreground or a violin in the background, every instrument had striking realism and precision, regardless of its position on the soundstage. Satisfied that the M28’s reproduction of stereo recordings was top-notch, I moved on to multichannel recordings."

"NAD’s Masters M27 is a very good multichannel amplifier that provides seven channels of relatively high power with clean, transparent sound, at a competitive price—but I found its successor, the M28 to be truly exceptional, with more power and even more neutral, better balanced sound, for only $1000 more. The M28 was so good that I had a hard time hearing any shortcomings in its performance."

"When I reviewed the NAD Masters M33, I proclaimed it the front-runner in the $5000 category of integrated amplifier-DACs. Now, the Masters M28 is my pick for front runner among $5000 multichannel amps. You’d be hard-pressed to find another amp in its price range that will provide as much power and sound as good with films or music. In fact, it would give many stereo power amps in its price range a run for their money."

"...if you want an amp that you can just plug in and get sound that’s perfectly neutral and natural regardless of what you play, look no further. NAD’s Masters M28 is an outstanding multichannel amplifier, and one of the best now available at any price."

- Roger Kanno, SoundStage! Access, March 15, 2021

"The NAD Masters M28 is an exceptional amplifier. Though pricey compared to other multi-channel amps, it's a no-brainer if it fits your needs and budget."

"...NAD’s Masters M28 is a genuinely unique product designed to compete sonically with some of the highest-end amps on the market, regardless of how many channels they offer."

- Thomas J. Norton, Sound & Vision, January 27, 2021