NAD M28 User Manual

M28 SEVEN CHANNEL POWER AMPLIFIER

M28 Seven Channel Power Amplifier

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The 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 280W 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 features
high-quality binding posts for speaker connection. The compact dimensions of this highly energy­efficient design belie the massive amount of power available for the most demanding music and
movies.

Purifi Hybrid Digital Amplification

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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 BluOS
Streaming DAC 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 HybridDigital™ designs. The result is a performance level that
approaches the theoretical limit in measured performance, be it at whispering levels or at full power.

In common with the previous generations of NAD HybridDigital 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 560W dynamic power into 4 Ohms is testament to this.

FEATURES & DETAILS

u HybridDigital™ Purifi Eigentakt

u FTC Power: 220W in 8 Ohms, 400W into 4 Ohms

u Rated Power: 200W into 8 Ohms, 340W into 4 Ohms

u Dynamic Power: 280W into 8 Ohms, 560W into 4 Ohms

u Balanced Line Inputs

u Single-ended Line Inputs

u 12V Trigger in

u Auto Turn-on

u Ground Lug

u Detachable AC Power Cord

™

Amplifier

Inherent to the Eigentakt™ technology is its very analogue-like behaviour in the unlikely event the
amplifier is driven into clipping. Whereas 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.

M28 Rear Panel

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Fully Balanced Audio

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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.

Effortless Power

As our most powerful amplifier ever, the M28

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can pump out over 560W 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!

Specifications M28

All specs are measured according to IHF 202 CEA 490-AR-2008 standard. THD is measured using AP AUX 0025 passive filter and AES 17 active filter.

OVERALL SPECIFICATIONS

FTC power, two channels

Rated power, all channels

Rated THD (250 mW to rated power, CCIF IMD, DIM 100)

IHF dynamic power

Damping factor

Input sensitivity

Input impedance

Input Impedance (r and c)

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≥ 220 W (ref. rated THD, 8 Ohms , 20 Hz - 20 kHz, two channels dri

≥ 400 W (ref. rated THD, 4 Ohms , 20 Hz - 20 kHz, two channels driven)

≥ 200 W (ref. rated THD, 8 Ohms , 20 Hz - 20 kHz, all channels dr

≥ 340 W (ref. rated THD, 4 Ohms , 20 Hz - 20 kHz, all channels driven)

≤0.003 % (ref. 20 Hz - 20 kHz)

280 W 8 Ohms, (all channels d

560 W 4 Ohms, (one channel driven)

> 750 (ref. 8 Ohms, 50 Hz and 1 kHz)

1.3 V (ref. rated power)

47 kΩ (Balanced)

23 kΩ (Single-ended)

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Signal/noise ratio

Frequency response

Time to go to Standby mode at no input signal

Standby power

DIMENSIONS AND WEIGHT

Gross dimensions WxHxD

Shipping Weight

Specifications are subject to change without notice. Check out www.NADelectronics.com for updated documentation or latest information about M28.

NAD Electronics International reserves the right to change specifications or features without notice. NAD is a registered trademark of NAD Electronics International.
All rights reserved. No part of this publication may be reproduced, stored, or transmitted in any form whatsoever without the written permission of NAD Electronics
International. © 02/20 19-101 NAD Electronics International. www.NADelectronics.com

> 102dB (A-weighted ref. 1W, Balanced)

> 97 dB (A-weighted ref. 1W, Sin

> 124 dB (A-weighted ref. rated power, Balanced)

> 120 dB (A-weighted ref. rated power, Single-ended)

.1 dB (ref. 20 Hz - 20 kHz)

± 0

- 3 dB at 3 Hz to 60 kHz

≤ 30 minutes

≤ 0.5W

435 x 156 x 380 mm (17 3/16 x 6 3/16 x 15”)

21.2 kg (46.7 lbs)

gle-ended)