Volume Pre Out; Bridge Mode; Soft Clipping; Ir In, Out - NAD C 372 Owner's Manual

If you are using a pair of power amplifiers specifically for Bi-Amping,
use the PRE OUT 2 sockets to connect the power amplifier with the
highest gain of the pair. By adjusting the VOLUME PRE OUT 2 control
(No. 11) the volume level can be matched exactly to that of the power
amplifier connected to the PRE OUT 1 sockets. Refer also to chapter
"Bi-Amping" for more information. Use a twin RCA-to-RCA lead to
connect to the left and right 'Audio Input' of the Power amp to the PRE
OUT 1 & 2 sockets.
NOTES: Always turn the C 372 and associated external power
amplifiers off before connecting or disconnecting anything to the PRE-
OUT 1, 2 and MAIN-IN sockets.
The PRE-OUT 1&2 output signals will be affected by the NAD C 372's
volume and tone control settings.

11. VOLUME PRE OUT 2

The VOLUME Pre-Out 2 control allows for adjustment of the output
level of the PRE OUT 2 sockets. The output level can be reduced from
0dB to -12dB; when set to the maximum position (at the 0dB position),
the output level will be identical to that of the PRE OUT 1 sockets. Refer
also to chapter "Bi-Amping" for more information.
NOTES: Always turn the C 372 and associated external power
amplifiers off before connecting or disconnecting anything to the PRE-
OUT 1, 2 and MAIN-IN sockets.
The PRE-OUT 1&2 output signals will be affected by the NAD C 372's
volume and tone control settings.

12. BRIDGE MODE

The NAD C 372 can be used as part of a higher power stereo or home-
theatre system, by connecting adding additional power amplifiers. If the
power amp section in the NAD C 372 is to be used to drive a single
speaker, then use the Bridge switch to run the built-in Left and Right
power amplifiers as a single channel, high power unit. Set the BRIDGE
MODE switch to the 'Bridge' position and connect the speaker to the
terminals marked 'L +' and 'R+' ensuring that the 'L+' is connected to the
'+' terminal on your loudspeaker and the 'R+' is connected to the
loudspeaker's '-' terminal. Connect the source to the Left MAIN-IN input.
In Bridged Mode the NAD C 372 will produce approximately 300W into
an 8 ohm loudspeaker. In this mode, the amplifier sections will react as
though the speaker impedance has been halved. Low impedance
speakers (under 8 ohms) are not recommended when using Bridge
Mode, as these may cause the amplifier's thermal cut-out to operate if
played at high levels.
The Bridge LED on the front panel (Fig. 2; No. 2) will illuminate when
the amplifier is in Bridge mode.
NOTES: Do not connect anything to the Right MAIN-IN input (No. 9)
when Bridge Mode is selected. Always turn the C 372 and associated
external power amplifiers off before connecting or disconnecting
anything to the PRE-OUT 1, 2 and MAIN-IN sockets.

13. SOFT CLIPPING™

When an amplifier is driven beyond its specified power output, a hard,
distorted sound can be heard on very loud sounds. This is caused by the
amplifier cutting off or 'hard clipping' the peaks of sound that it was not
designed to reproduce. The NAD Soft Clipping™ circuit gently limits the
output of the system to minimise audible distortion if the amplifier is
overdriven.
If your listening involves moderate power levels you may leave the Soft
Clipping™ switch to Off. If you are likely to play at high levels, that could
stretch the amplifier's power capability, then switch Soft Clipping On.
The Soft Clipping™ indicator on the front panel will illuminate when the
amplifier is in Soft Clipping mode.

14. IR IN, OUT

The IR IN/OUT connector is used to pass commands from other units
fitted with IR IN/OUT connectors. This allows centralized control of a
complete system, and also allows some of the basic functions of other
NAD components (such as a tuner, CD player or cassette-deck) also
equipped with IR IN/OUT to be controlled with the amplifier's remote
control. To function with such other units, connect the C 372's IR OUT
to the IR IN on the other unit. The IR connectors can be daisy-chained,
IN to OUT, so that a whole system can be controlled from the remote
control facilities of one unit.
NOTES: It is advisable not to connect IR IN/OUT if these units that have
their own built-in remote control command receiver and are positioned
together, in direct view from the remote control handset. If you are
unsure, try operating the products without IR IN/OUT first; If the unit
responds to the remote control command, it will not be necessary to
connect IR IN/OUT. Never loop the last unit back to the first NAD unit in
the IR IN/OUT chain. Unplug all units from the mains before connecting
or disconnecting IR IN/OUT.
15. 12V TRIGGER OUT
This output allows to remotely switch on or off ancillary equipment such
as a tuner, power amplifier, etc. which are also equipped with a 12V
trigger input. This can also be an AC outlet power strip equipped with
a 12V trigger input. The 12V trigger output is activated whenever the
unit is switched to normal operational mode from Stand-by or Off.
For switching Stand-by/Power On of an external component through
the C 372, connect the12V-trigger output of the C 372 to the remote
component's DC input jack. The plug required is a standard 3.5mm
Mini-Jack plug ("mono"): The tip is the live or + connection, the shaft
of the input jack is the 12V-trigger - or ground connection.
NOTES: Check the specifications of the Trigger input terminal on the
other components to ensure these are compatible with the C 372's 12V-
trigger output. NAD components equipped with 12V input triggers are
fully compatible with the C 372's 12V output trigger. The C 372's 12V-
trigger output voltage is 12V DC. The total maximum current must not
exceed 200mA. Typically, NAD 12V input triggers draw less than 10mA
of current.
Before making any connections to any 12V trigger input or output,
make sure all components are disconnected from the AC mains.
Failure to observe the above may result in damage to the C 372 or any
ancillary components attached to it. If in doubt over the connections,
installation and operation of the 12V trigger output consult your NAD
dealer.
16. SPEAKERS A + SPEAKERS B
The NAD C 372 is equipped with two sets of speaker connectors. Use
the Speakers A connectors for the 'main' speakers and use the Speakers
B connectors for a second pair, for example, extension speakers located
in another room.
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