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ABOUT THE M25

Designed specifically for home theatre and custom installation set-ups,

the NAD M25 Power Amplifier delivers uncompromising performance.

It combines supreme reliability, flexibility, and performance with

outstanding value. Flexibility has always been an important part of

NAD components. Such flexibility is particularly important in home

theatre and other multi-channel systems. That’s because it is common

for a multi-channel system to incorporate different brands and models

of loudspeakers. Often these speakers have different levels of

efficiency. The individual input level controls for the seven channels of

the NAD M25 make it easy to compensate for such differences in

efficiency, and achieve the ideal system balance. Ample dynamic

headroom of the M25 ensures that the very wide dynamic range of

modern cinema soundtracks and digital music sources will be

preserved. In addition, the M25 will handle low impedance speakers

with ease.

The M25 incorporates NAD’s unique Soft-Clipping circuitry in all seven

channels. Any amplifier can be overdriven if it is played too loud,

exceeding the maximum output power. Under such circumstances,

amplifiers produce extreme high levels of distortion which, besides

sounding very unpleasant, can damage your loudspeakers. The Soft

Clipping circuit suppresses such distortion and minimizes the risk of

damage to speakers. This is particularly important with movie

soundtracks which often contain very dynamic outbursts in which,

unlike music, it is difficult to hear this potentially damaging distortion.

The Soft Clipping LED on the front panel illuminates when the Soft

Clipping circuit is engaged. Soft Clipping can be defeated with a rear

panel switch.

The 12V trigger connection on the back panel allows the amplifier to

be switched from On to Stand-by and vice-versa remotely. This way,

the M25 can be part of a system which can be turned on and off with

a single command, easing operation. The 12V trigger also allows the

amplifier to be installed in places not in easy reach. 

THE DESIGN

The NAD M25 houses seven individual amplifiers, each on separate

circuit board. Each amplifier channel acts as a “mono block” within

the chassis. Each input connector, and set of loudspeaker output

terminals, is directly connected to that channel’s circuit board. This

design eliminates extra wiring and keeps signal paths short.

Furthermore, this modular design increases reliability and thermal

efficiency. The input circuit uses a totally new dual differential input

topology that operates in true Class-A mode. The special Holmgren™

toroidal transformer has less hum and magnetic leakage than

conventional toroidal transformers, but retains the usual benefits of

high efficiency and high power-to-weight ratio. 

Ruggedness and reliability are critical in custom-installed systems. The

M25 uses a combination of fuses and non-intrusive electronic

protection. This provides highly effective protection that does not

effect audio performance. Each channel is protected against excess

temperature, DC fault and loudspeaker short-circuit. The M25’s

inherently conservative, high-voltage/high-current output stage has

been designed for years of trouble-free service.

NAD was the first company to introduce a THX® Certified power

amplifier. In that tradition, the M25 easily passes THX Ltd.s' stringent

THX® performance requirements. As a result the NAD M25 will

handle the most demanding signals with ease, and yet preserve every

subtle audio detail in the most demanding THX® Ultra2™ Surround

systems. THX and Ultra2 are trademarks or registered trademarks of

THX Ltd. All rights reserved.

POWERDRIVE

To meet the diverse requirements of high current drive and high

dynamic power, our patented PowerDrive amplifier circuit will build

further on our reputation for amazingly effective power. By adding a

second high-voltage rail to our well regulated high-current power

supply, we get an "overdrive" that can nearly double the continuous

power on a short term dynamic power basis. This is a further

development and refinement of our renowned Power Envelope circuit,

utilized by NAD in the 80's and 90's. PowerDrive differs from Power

Envelope in that it offers greater amplifier stability and low impedance

drive capability, resulting in less distortion when driving real speakers

with real program material

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