8
PRE
OUT 1:
The
PRE
OUT
1
sockets
can
be
used
to drive
an
additional
power amplifier.
Use
atwin
RCA-to-RCA
lead
to connect to the left
and
right"Audio Input"
of
the
Power
amplifier or
processor
to the
PRE
OUT
1
sockets.
Always
turn the C
37SBEE
and
associated
external power amplifiers
OFF
before connecting or disconnecting anything to the
PRE
OUT
1
sockets.
The
PRE
OUT
1output
signal
will
be
affected
by
the C
37SBEE's
volume
and
tone control settings.
9MAIN IN: Connections to
an
external pre-amplifier or
processor,
such
as
asurround-sound decoder.
In
normal
use,
this should
be
connected
to
PRE
OUT
2
sockets
with the
links
supplied.
To
connect your
NAD
C
37SBEE
to external processor or pre-amplifier, remove first
these
links.
Use
atwin
RCA-to-RCA
lead
to connect the left
and
right"Audio Output"
ofthe pre-amp or
processor
to the Main
In
sockets.
Always
turn the C
37SBEE
and
associated
external power amplifiers
OFF
before connecting or disconnecting anything to the
MAIN
IN
sockets.
10
PRE
OUT2:
Connections
to
an
external
poweramplifier or
processor,
such
as
asurround-sound
decoder.
In
normal
use,
thiS
should
be connected to
the
Main
In
sockets
with the
links
supplied.
To
connect your
NAD
C
37SBEE
to
external
processor
or amplifier
sections,
remove
first
these
links.
Use
a
twin
RCA-to-RCA
lead
to connect the left
and
right
"Audio
Input"
of
apower
amplifier
or
processor
to the
PRE
OUT
2
sockets.
Always
turn the C
37SBEE
and
associated
external power amplifiers
OFF
before connecting or disconnecting anything to the
PRE
OUT
2
sockets.
The
PRE
OUT
2output
signal
will
be
affected
by
the C
37SBEE's
volume
and
tone control settings.
11
VOLUME
PRE
OUT 2:
The
VOLUME
PRE-OUT
2control allows for
adjustment
of
the output
level
of
the
PRE
OUT
2
sockets.
Turn
clockwise
to
increase
the
PRE
OUT
2volume setting; counter clockwise to lower
it.
When
set
to the maximum position, the output
level
will
be
identical
to that
of
the
PRE
OUT
1
sockets.
Refer
also
to the item below about
"Bi-Amping':
BI·AMPING
Some
loudspeakers
have
separate
connection terminals for the
LF
(Low
Frequency)
and
HF
(High
Frequency)
sections
of
the
speaker.
This
facility
allows to"Bi-Amp"these
speakers,
where a
separate
power amplifier
is
used
for the
LF
and
HF
section, which
may
improve overall sound
quality.
The
C
37SBEE
provides
two
sets
ofpreamplifier outputs
(PRE
OUT
1
and
PRE
OUT
2)
to
facilitate
the connections
for
Bi-Amping.
Moreover,
the
level
from
PRE
OUT
2
can
be
reduced
in
relation
to
PRE
OUT
1to accommodate
power
amplifiers
with different
gain
(amplification
factor).
To
set
up the C
37SBEE
with power
amplifiers
first
decide which power
amplifier
has
the highest
gain.
This
is
easily
done
by
comparing the
loudness
level
ofthe power
amplifiers
in
an
identical
system
(keep
the
volume control
at
the
same
level;
use
the
same
source
and
speakers).The
amplifier that
plays
louder
has
the highest
gain
(note that
this
does
not
need
to
be
the
more
powerful amplifier
of
the two). Connect the amplifier
with highest
gain
to the
PRE
OUT
2
sockets;
the other power amplifierto
the
PRE
OUT
1
sockets.
From
the maximum
level
position,
use
the
VOLUME
PRE
OUT
2control to
reduce
the output
level
of
PRE
OUT
2
so
that the
volume
level
ofboth power
amplifiers
is
exactly
matched.
IDENTIFICATION
OF
CONTROLS
REAR
PANEL
12
BRIDGE MODE:
The
C
37SBEE
amplifier
can
be
configured to
be
MONO
(Bridge
Mode),
more than doubling
its
output
power.
This
way,
the C
37SBEE
can
be
used
as
part
of
ahigh power
stereo
or home-
theatre
system,
by
connecting additional power amplifiers.
In
BRIDGED
MODE
(switch
at
ON
setting), the C
37SBEE
will produce
apprOXimately
330W
into
an
Bohm
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 Left
INPUT
sockets.
The
BRIDGE
MODE
indicator
on
the front
panel
will illuminate when the
C
37SBEE
is
in
Bridge mode.
Return
normal
speaker
connections
(Refer
also
to the item below about
"SPEAKERS
A,B").
and
keep
BRIDGE
MODE
switch to
"OFF"
position for normal
stereo
listening.
NOTE
Do
notconnect anything to the
Right
Input
socket when
Bridge
Mode
is
selected.
13SOFT CLIPPING'":
Enables
NAD's
proprietary
Soft
Clipping circuitry'
on
all
channels.
At
[ON]
position,
Soft
Clipping gently limits the output
of
the C
37SBEE
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
indicatoron the front
panel
will illuminate when
the C
37SBEE
is
in
Soft
Clipping mode.
See
also
below the item about
"POWERDRIVE~
POWER
DRIVE
The
C
37SBEE
uses
NAD's
proprietary PowerDrive'" amplifier technology
for
all
channels to
preserve
accurate,
linear reproduction
regardless
of
the
loudspeaker.
This
uniquely efficient power-supply topology
prOVides
the real-world benefits
of
high dynamic power that
remains
uncompromised
by
low-impedance
speakers.
By
adding a
second
high-voltage
rail
to our
well
regulated
high-current
power
supply,
we get
an
"overdrive"that
can
nearly
double the continuous
power
on
a
short
term
dynamic power
basis.
PowerDrive
offers
greater
amplifier stability
and
low impedance
drive
capability,
resulting
in
less
distortion
when
driving
real
speakers
with
real
program
material.
9
