NAD Understanding the Operation and Protection of Amplifiers

Operation

NAD OMC

NAD’s proprietary Output Management Circuit (OMC) ensures that the full power is available at any reasonable load impedance. The OMC controls individual amplifier channels by managing the input level, in case of deliberately excessive input signal, and/or output level, in case of speaker or speaker cable fault. This not only protects the amplifier, but it also prevents loads attached to the amplifier from heating up excessively, an important factor when the reliability of an installed system is a consideration. When the OMC detects a potential fault situation and begins to limit current flow, an amber-coloured LED illuminates on the front panel to alert the installer/owner of a problem in the system. When the OMC is activated, the amplifier will continue to play without distortion, but the power level will be reduced to the amplifier channel that has the problem. If the fault condition persists and the impedance becomes too low the affected channels will initiate the NAD Protection Circuitry (see NAD Protection Circuitry below).

NAD PROTECTION CIRCUITRY

Every design decision, both electronic and mechanical, was made with absolute reliability of the amplifier as the primary goal. An auto-resetting protection circuit is also part of the CI-series amplifiers’ design. The fast acting protection circuit jumps into action if the amplifier overheats or encounters a short circuit condition. A red front-panel LED indicates that the Protection circuit has been activated. Only the amplifiers being affected by a short circuit condition will be in the protection mode; all other channels will continue to play normally. When the condition is normalized the affected channels reset. In the unlikely event of amplifier failure, the CI-series amplifier is designed to be easily field serviceable with all amplifying circuitry mounted on plug-in modules.

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