User manual NAD T955

[. . . ] 1 Read instructions - All the safety and operating instructions should be read before the product is operated. 2 Retain instructions - The safety and operating instructions should be retained for future reference. 3 Heed Warnings - All warnings on the product and in the operating instructions should be adhered to. 4 Follow Instructions - All operating and use instructions should be followed. [. . . ] 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. The individual input level controls for the five channels of the NAD T955 make it easy to compensate for such differences in efficiency, and achieve the ideal system balance. Ample dynamic headroom of the T955 ensures that the very wide dynamic range of modern cinema soundtracks and digital music sources will be preserved. the T955 incorporates NAD's unique Soft-Clipping circuitry in all five 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. 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 T955 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 T955 houses five 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. 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 HolmgrenTM 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. 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 T955's inherently conservative, high-voltage/high-current output stage has been designed for years of trouble-free service. [. . . ] When connecting speakers, take care that the red (positive) terminal on each loudspeaker is connected to the corresponding terminal marked red (positive) on the amplifier. The center pin is the live or + connection, the outer sleeve of the input jack is the 12V-trigger - or ground connection. NOTES: The T955's 12V-trigger will work within a range of 6 to 15 V DC level and typically draws less than 10mA of current. check the specifications of the 12V-trigger source to ensure it is compatible with the T955's 12V-trigger input. [. . . ]