Installation Precautions - NAD 925THX Manuel D'installation

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About the 925THX

Designed specifically for home theater and cus-

tom installation set-ups, the NAD 925THX Power

Amplifier delivers uncompromising performance. It

combines supreme reliability, flexibility, and perfor-

mance with outstanding value.

Flexibility has always been an important part of NAD

components. Such flexibility is particularly important

in home theater and other multi-channel systems.

That's because it is common for a multi-channel sys-

tem to incorporate different brands and models of loud-

speakers. Often these speakers have different levels

of efficiency. The individual input level controls for the

five channels of the NAD 925THX make it easy to

compensate for such differences in efficiency, and

achieve the ideal system balance.

Ample dynamic headroom of the 925THX ensures

that the very wide dynamic range of modern cinema

soundtracks and digital music sources will be pre-

served. In addition, the 925THX will handle low im-

pedance speakers with ease.

The 925THX incorporates NAD's unique Soft-Clip-

ping circuitry in all five channels. Any amplifier can be

overdriven if it is played too loud, exceeding the maxi-

mum output power. Under such circumstances, am-

plifiers 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 out-

bursts in which, unlike music, it is difficult to hear this

potentially damaging distortion. Five status LED's on

the front panel illuminate when the Soft Clipping cir-

cuit is engaged. Soft Clipping can be defeated with a

rear panel switch.

The design:

The NAD 925THX houses five individual amplifi-

ers, 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 cir-

cuit 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 925THX uses a combination

of fuses and non-intrusive electronic protection. This

provides highly effective protection that does not ef-

fect audio performance. Each channel is protected

against excess temperature, DC fault and loudspeaker

short-circuit. The 925THX's inherently conservative,

high-voltage/high-current output stage has been de-

signed for years of trouble-free service.

NAD was the first company to introduce a THX

certified power amplifier. In that tradition, the 925THX

easily passes Lucas Films' stringent THX performance

requirements. As a result the NAD 925THX will handle

the most demanding signals with ease, and yet pre-

serve every subtle audio detail in the most demand-

ing THX and Dolby Surround systems.