NAD C370, Руководство пользователя

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8
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 NAD C370 provides two sets of pre amplifier outputs (PRE
OUT 1 & 2) to facilitate the connections for Bi-Amping. Moreover,
the level from PRE OUT 2 can be reduced in relation to PRE OUT
1 to accommodate power amplifiers with different gain
(amplification factor).
To set up the C370 with power amplifiers first decide which power
amplifier has the highest gain. This is easily done by comparing
the loudness level of the 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 (No. 10) sockets; the other power amplifier to the
PRE OUT 1 (No. 8) sockets.
From the maximum level position (0dB), use the VOLUME PRE
OUT 2 control (No. 11) to reduce the output level of PRE OUT 2
so that the volume level of both power amplifiers is exactly
matched.
NOTES: The gain of the NAD C270 power amplifier is identical to
that of the C370's built-in power amplifier (in fact, the C270 and
C370's power amplifier section are almost identical). When
combined with the NAD C270 for Bi-Amping, leave the PRE-OUT 1
connected, with the links provided, to MAIN-IN. Connect the C270
to the PRE-OUT 2 output. Set the VOLUME PRE-OUT 2 control to
its maximum position.
The provided links to connect from PRE-OUT 1 to MAIN-IN can
also be used to connect from PRE-OUT 2 to MAIN-IN, should the
C370's power amplifier have the highest gain. Always turn the
C370 and external power amplifiers off before connecting or
disconnecting anything from Pre-Out and to Main-In sockets.
REMOTE CONTROL HANDSET (FIGURE 3)
The Remote Control handset handles all the key functions of the
NAD C370 and has additional controls to remotely operate NAD
Tuners, Cassette and CD machines. It will operate up to a distance
of 16ft (5m).
Alkaline batteries are recommended for maximum operating life.
Two AAA (R 03) batteries should be fitted in the battery
compartment at the rear of the Remote Control handset. When
replacing batteries, check that they have been put in the right way
round, as indicated on the base of the battery compartment.
Please refer to previous sections of the manual for a full
description of individual functions.
When a command from the remote control is received, the Stand-
by/protection indicator will blink. Note that the indicator may also
blink when receiving commands not necessarily for the C370 but
for other components in the system.
1. STANDBY/ON BUTTON
When the amplifier is switched On, pressing the green On/Off
button on the remote handset will put the NAD-370 into Standby
mode and the Power indicator will turn amber. The amber Power
indicator shows that power is being supplied to the NAD-370, but
the system is currently in the Standby Mode. Press again to switch
the amplifier On from Stand-by mode.
2. POWER ON & OFF
Besides the On/Off toggle function of the green button (No. 1), the
NAD C370 remote also has a separate On and Off button. This can
be particularly useful to keep components within a system "in-
sync": This way all components will switch to stand-by when Off is
pressed or switch to operating mode when On is pressed, instead
of some components switching On when the amplifier is switched
to Stand-by. (Note that the other components have to be capable
of responding to the separate On and Off commands as well).
Press the ON button to switch the unit from Stand-by to the
operating mode; The Stand-by indicator (Fig. 2; No. 2) will turn
from amber to green and the indicator for the last selected input
will blink and light up. Press the OFF button to switch the unit to
the Stand-by mode: The Stand-by indicator will light up amber.
3. SPEAKERS A & B
These buttons perform the same function as those on the front
panel. The Speakers A and B buttons engage or disengage the
speakers connected to respectively the Speakers A and Speakers B
terminals on the rear panel.
Press A to switch the speakers connected to the speaker A
terminals On or Off. Press B to switch the speakers connected to
the speaker A terminals On or Off. The indicator directly over the
buttons shows the status of speakers A and B.
4. MUTE
Press the MUTE Button (No. 4) to temporarily switch off the sound
to the speakers and headphones. Mute mode is indicated by the
active input indicator on the front panel flashing. Press MUTE
again to restore sound. Mute does not affect recordings made
using the Tape outputs but will affect the signal going to the Pre-
amp outputs (Pre-Out 1 &2).
5. INPUTS
The input selector buttons (No. 5) perform the same functions as
the buttons labelled the same on the front panel. There are a few
differences and extra functions with the remote control handset
however:
The TUNER AM & FM buttons select the Tuner input on the NAD
C370 and respectively the AM or FM waveband on a separate
remote controllable NAD Tuner (if supported by the tuner).
6. MASTER VOLUME
Press the MASTER VOLUME or (No. 6) buttons to
increase, respectively decrease the loudness level. Release the
button when the desired level is reached. The motorised Volume
Control on the front panel will indicate the level set. The Master
Volume buttons do not affect recordings made using the Tape
outputs but will affect the signal going to the Pre-amp outputs
(Pre-Out 1 &2).