NAIM AMPLIFIERS Owner's Manual - page 14
12
NAC 202
14.1 Input Socket Mapping (Program Mode)
The input selector buttons select the source input signal to be
routed to the power amplifier and the loudspeakers.
The NAC 202 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 202 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. If no
function is operated within five minutes of entering program
mode the NAC 202 will return to normal mode automatically.
Once in program mode press and hold the remote handset
1
button to select or de-select the RCA Phono socket input for CD,
and the remote handset
6
button 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
remote until the volume indicator stops flashing.
14.2 Automatic Input Switching
The NAC 202 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
202 and the CD play key is operated on the handset, the NAC
202 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 202
into program mode as described in Paragraph 14.1. The front
panel
mon
button will illuminate if automatic switching is already
enabled. If it is not enabled it can be switched on by pressing
the front panel
mon
button twice.
With auto switching enabled, pressing the front panel
mon
button will reveal the inputs selected for auto switching by
their button indicators illuminating for a short time. Repeated
operation of the
mon
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
mon
button.
The remote handset
mon
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.
14.3 AV Integration (Unity Gain)
The NAC 202 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 202
inputs. Unity gain can be selected on the AV input only.
To select unity gain, first switch the NAC 202 into program mode
as described in Paragraph 14.1. The front panel
mute
button will
illuminate if unity gain is selected. If it is not enabled it can be
switched on by pressing the
mute
button twice. Deselect unity
gain by again pressing the
mute
button.
Unity gain 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 202 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.
14.4 Handset Volume Control
The remote handset
volume
key provides 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.
14.5 Channel Balance
Channel balance adjustment is operated electronically within
the preamplifier and is controlled by the remote handset
bal
keys only. Balance will automatically centre as it reaches the
mid point. Centring is indicated by a flashing volume control
indicator. To resume adjustment once the balance has centred,
a handset
bal
key must be released and re-pressed.
The handset
bal
keys provides 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.
14 Installation and Operation
The NAC 202 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. An optional separate NAPSC
supply to provide power to the display and control circuits is also available. Diagram
15.3 illustrates the NAC 202 connected to a Hi-Cap power supply.