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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.
ENGLISH
FRANÇAISDEUTSCHNEDERLANDSESPAÑOL
ITALIANO
PORTUGUÊS
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CI9120_9060 manual (GB) 12/12/02 9:09 pm Page 7