Important Notes - NAD C 275BEE Owner's Manual

IDENTIFICATION OF CONTROLS
REAR PANEL
4 BRIDGE MODE: The C 275BEE amplifier can be configured to be
MONO (Bridge Mode), more than doubling its output power. This way,
the C 275BEE can be used as part of a high power stereo or home-
theatre system, by connecting additional power amplifiers.
In BRIDGED MODE, the C 275BEE will produce approximately 330W 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.
Set the BRIDGE MODE switch to the "ON" position and connect the
speaker to the terminals marked "L +" and "R+" ensuring that the "L+"
is connected to the "+" terminal of your loudspeaker and the "R+" is
connected to the loudspeaker's " - " terminal. Connect the source to
the INPUT sockets.
The BRIDGE MODE indicator on the front panel will illuminate when the
C 275BEE is in Bridge mode.
NOTE
Do not connect anything to the Right Input socket when Bridge Mode
is selected.
5 SOFT CLIPPING™: Enables NAD's proprietary Soft Clipping circuitry
on all channels. At [ON] position, Soft Clipping gently limits the output
of the C 275BEE to minimize audible distortion should the amplifier be
over-driven. Soft Clipping may simply be left ON at all times to reduce
the likelihood of audible distortion from excessive volume settings.
However, for critical listening and to preserve optimum dynamics, you
may wish to defeat it by setting this switch to "OFF" position.
The SOFT CLIPPING indicator on the front panel will illuminate when the
amplifier is in Soft Clipping mode.
6 +12V TRIGGER IN/INPUT SENSE - OFF/AUTO: The OFF/AUTO switch
is applicable for INPUT SENSE only. At AUTO setting, the C 275BEE will
instantaneously turn ON from standby mode if it senses any input signal
(approximately above 20mV RMS input) applied through the INPUT
sockets.
In the absence of any input signal at the INPUT sockets and with OFF/
AUTO switch set to AUTO, the C 275BEE will switch to standby mode.
Slide the OFF/AUTO switch to OFF setting for the C 275BEE to be
normally switched ON (or back to standby mode) using the front panel
STANDBY button.

IMPORTANT NOTES!

• At input sense mode, it will take about 10 minutes for the C 275BEE to
go to standby mode when the input signal source is turned OFF or goes
below 20 mV.
• If the C 275BEE is switched ON via INPUT SENSE mode, it cannot be
switched back to standby mode via the front panel STANDBY button. The
C 275BEE will switch back to standby mode in the same manner it was
activated. For the C 275BEE to go to standby mode, the input signal can
be completely turned off or brought down to a level lower than 20mV.
8
7 +12V TRIGGER INPUT: The +12V Trigger input allows the C 275BEE
to be switched remotely from standby mode to ON and vice-versa
by ancillary equipments such as a preamplifier, AV processor, etc. The
controlling device must be equipped with a 12V trigger output to use
this feature.
8 FUSE HOLDER: In the unlikely event a fuse may need to be replaced,
unplug the AC cord from the wall. Then, remove all connections from
the amplifier. Use a flathead screw driver or similar to open the fuse
holder via the slot indicated. With the screw driver in place, push and
turn counterclockwise to open the fuse holder. Only replace the
fuse with the same type, size, and specification – T10AL 250V for 120V
version or T5AL 250V for 230V version.
IMPORTANT NOTICE
Do not use any substitute fuses of different types or with different ratings
or values. Failure to observe this precaution may cause damage to the
amplifier circuits and may create a fire hazard and/or defeat the safety
built into the amplifier and may void the warranty.
9 SPEAKERS A, B: The C 275BEE is equipped with two sets of speaker
connectors. Use the Speakers A terminals for the "main" speakers and
use the Speakers B terminals for a second pair, for example, extension
speakers located in another room.
Connect the right speaker to the terminals marked "R +" and "R-" ensuring
that the "R+" is connected to the "+" terminal on your loudspeaker and the
"R-" is connected to the loudspeaker' s "-" terminal. Connect the terminals
marked "L+" and "L-" to the left speaker in the same way.
In Bridge Mode, connect the single speaker to the terminals marked
"R +" and "L+" ensuring that the "L+" is connected to the "+" terminal
on your loudspeaker and the "R+" is connected to the loudspeaker's "-"
terminal. Refer also to the section above about "BRIDGE MODE.
Always use heavy duty (16 gauge; 1.5mm, or thicker) stranded wire to
connect loudspeakers to your NAD C 275BEE. The high-current binding
post terminals can be used as a screw terminal for cables terminating in
spade or pin sockets or for cables with bare wire ends.
10 AC MAINS INPUT: The C 275BEE comes supplied with a separate AC Mains
cable. Before connecting the cable to a live wall socket ensure that it is
firmly connected to the C 275BEE' s AC Mains input socket first. Connect
only to the prescribed AC Outlet, i.e., 120V 60 Hz or 230V 50 Hz. Always
disconnect the AC Mains cable plug from the live wall socket first, before
disconnecting the cable from the C 275BEE' s Mains input socket.
11 POWER SWITCH: The POWER switch supplies the master AC mains
power for the C 275BEE. Refer to the ATO LOGIC chart below for a better
understanding of the role of the POWER switch when switching ON
or OFF the C 275BEE. If you intend not to use the C 275BEE for long
periods of time (such as when on vacation), switch the POWER switch
to the OFF position.