NAD CI9120 - Manual

• 12 x 80W Continuous Power (6 ohms), all channels driven
simultaneously
• Multi-channel poweramp for custom installation
• Flex-Pad allows easy system configuration
• Autologic turn on circuit
• Output management circuit (OMC) ensures reliability
• Individual input level controls
• EIA rack mount kit included
• Quiet low-pressure cooling system
loads attached to the amplifier from heating up excessively, an
important factor when the liability 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 to 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.
Reliability
Every design decision, both the electronic and mechanical, was
made with absolute reliability as the primary goal. An auto-
resetting protection circuit is also part of the CI 9120’s design.
The fast acting protection circuit jumps into action if the amplifier
overheads or encounters a dead short circuit condition. A red
front panel LED indicates that the protection circuit has been
activated. When the condition is normalized the amplifier resets
to Standby condition. In the unlikely event of amplifier failure,
the CI 9120 is designed to be easily field serviceable with all
amplifying circuitry mounted on plug-in modules.
Low pressure cooling
With the CI 9120’s highly efficient low-pressure cooling system,
it is very unlikely that the protection system will ever encounter
an overheating situation. High-volume, low-pressure, fans
keep both the power supply and the output stage cool, yet are
essentially quiet in operation. Thermostatically controlled, the
fans automatically adjust to the ambient temperature to insure
the optimum operating conditions for the amplifier at all times.
Flexibility
The ideal Custom Installation amplifier not only has to have
absolute reliability and great sound quality, but it also must
be flexible enough to interface correctly with a variety of other
devices, and often diverse system requirements. NAN has
developed two unique features that endow the CI 9120 with
exceptional flexibility.
Flex-Pad
The Flex-Pad allows the CI 9120 to drive from 1 to 12
independent zones, in any configuration of stereo or mono (or in
mixed combination), without resorting to the confusion, sonic
CI 9120 12-Channel Power Amplifier
The NAD CI 9120 is a clean-sheet design 12
channel amplifier specifically engineered to meet the
demanding requirements of the advanced custom
installation market. The result of this intensive
design effort is an amplifier that sets new standards
for “bullet-proof” reliability and sonic performance in
this specialized category.
Power
Man of the amplifiers designed for multi-zone
distributed audio are just not powerful enough.
The CI 9120 at 80 Watts Continuous power per
channel, boasts nearly double the power of most
other competing amplifiers. This is very critical,
because unlike a normal hi-fi amplifier that only has
to send its signal to speakers across room, custom
installations often demand that the signal be sent
from one end of the home to the other. The series
resistance of long runs of speaker wire combined
with impedance-matched volume controls can create
special demands on an amplifier that the CI 9120
has been designed to overcome.
OMC
NAD’s proprietary Output Management Circuit
(OMC) ensures that the full power is available at any
reasonable load impedance. If the load impedance
falls below 3 ohms, indicating something other than
a loudspeaker is connected to the amplifier channel,
the OMC will limit the power flow and prevent the
amplifier from overdriving or overheating. This is
not only protects the amplifier, but it also prevents