NAIM Amplifiers, Owner'S Manual

Page: 11 / 40

9
NAC 282
Preamplifier
11.1 Source Inputs and Record Outputs
The input selector buttons arranged along the upper bank
select the source signal to be routed to the power amplifier
and the loudspeakers. Below them, in the
lower bank, are a
corresponding array of buttons which select the signal to be
routed to the preamplifier’s record outputs.
These separate source and record sections enable one source (a
CD player, for example) to be listened to whilst the output from
another (say, the tuner) is simultaneously selected for recording.
Note: It is possible to lock the record controls and prevent
accidental de-selection during recording. Record-lock is switched on
or off by depressing the source
mono button four times within six
seconds.
11.2 Input Socket Mapping (Program Mode)
The NAC 282 has six DIN input sockets and two alternative pairs
of RCA Phono sockets. The RCA Phono sockets can be mapped
individually to the CD and AUX 2 input buttons in place of the
DIN sockets.
Input mapping setup is accessed through the NAC 282 program
mode. To switch into program mode press and hold the
prog
key
on the remote handset (in preamplifier mode). Program mode is
indicated by a flashing indicator on the volume control and the
record select indicators extinguishing. If no function is operated
within five minutes of entering program mode the NAC 282 will
return to normal mode automatically.
Once in program mode press and hold the remote handset 1
key to select or de-select the RCA Phono socket input for CD,
and the remote handset
6 key to select or de-select the RCA
Phono socket input for AUX 2. The corresponding front panel
input buttons can similarly be used to select or de-select the
RCA Phono socket inputs.The appropriate input button indicator
will flash three times on selection of the RCA Phono option and
once on selection of the DIN option.
To exit from program mode press and hold the prog key on the
handset until the record select indicators are restored and the
volume indicator stops flashing.
11.3 Automatic Input Switching
The NAC 282 incorporates an optional automatic input switching
feature which can select the appropriate input as soon as any
handset function for a particular Naim source component is
operated. For example, if the tuner input is selected on the NAC
282 and the CD play key is operated on the handset, the NAC
282 will automatically switch to the CD input. Automatic input
switching can be programmed to operate independently on any
combination of the CD, AV and Tuner input buttons.
To enable automatic input switching, first switch the NAC 282
into program mode as described in Paragraph 11.2. The front
panel source mono button will illuminate if automatic switching
is already enabled. If it is not enabled it can be switched on by
pressing the
source mono button twice.
With auto switching enabled, pressing the source mono button
will reveal the inputs selected for auto switching by their button
indicators illuminating for a short time. Repeated operation
of the
source mono button will sequentially select each
combination of CD, Tuner, AV inputs, and auto switching disabled
(CD, Tuner and AV button indicators off). When the desired
inputs selected for auto switching are indicated, stop pressing
the
source mono button.
The remote handset mono (Flash) or mon (Narcom 3) key can
also be used to set up automatic source switching. Automatic
input switching only becomes operational on exiting from
program mode by pressing and holding the handset
prog key.
Note: In a few cases some further equipment configuration may
be required for auto switching to operate correctly on the AV input.
Please contact your retailer or local distributor for advice.
11.4 AV Integration (Unity Gain)
The NAC 282 unity gain function enables an audio-visual
processor to be integrated such that its volume control takes
over command of signals connected to selected NAC 282
inputs. Unity gain can be selected on the AV input only.
To select unity gain, first switch the NAC 282 into program mode
as described in Paragraph 11.2. The front panel
source mute
button will illuminate if unity gain is selected. If it is not enabled
it can be switched on by pressing the
source mute button twice.
Deselect unity gain by again pressing the source mute button.
Unity gain options only become operational on exiting from
program mode by pressing and holding the handset
prog key.
Note: The unity gain feature must be used with care. It effectively
by-passes the NAC 282 volume and balance controls leaving any
signal connected to a unity gain input to be passed to the power
amplifier and speakers at full volume. Additionally, if the AV input
is selected while unity gain is enabled the volume and balance
handset functions will be disabled and their indicators will turn off.
This will be flagged by the volume or balance indicators flashing if
either handset function is operated.
11.5 Handset Volume and Balance Control
The remote handset volume and balance keys provide some
alternative control characteristics. A quick press and release of
a key will adjust by a preset “nudge”. A quick press and release
of a key followed by press and hold will cause continual slow
adjustment. Simple press and hold will cause continual fast
adjustment.
11 Installation and Operation
The NAC 282 preamplifier does not incorporate an internal power supply but must be
used in conjunction with either a Naim power amplifier incorporating a preamplifier
power output, or with an appropriate Naim power supply. A separate NAPSC supply that
provides power to the display and control circuits is also supplied. Diagrams 12.3 and
12.4 illustrate two NAC 282 power supply options.