User Guide

15
NAC 112x
17.1 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 112x 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 112x 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 112x 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.
17.2 Automatic Input Switching
The NAC 112x incorporates an optional automatic input
switching feature which can select the appropriate input when
any handset function for a particular Naim source component is
operated. For example, if the tuner input is selected on the NAC
112x and the cd play key is operated on the handset, the NAC
112x will automatically switch to the cd input. Automatic input
switching can operate on any combination of the cd, tuner and
av inputs.
To enable automatic input switching, first switch the NAC 112x
into program mode as described in Paragraph 17.1. Program
mode is indicated by a flashing indicator on the volume control.
The front panel mon button will illuminate if automatic input
switching is already enabled. If it is not enabled it can be
activated by pressing the handset
mon
key or front panel
mon
button twice.
With automatic input switching enabled, pressing the
mon
key
or the
mon
button will reveal the inputs selected for automatic
input switching by their button indicators illuminating for a short
time. Repeated operation of the
mon
key or
mon
button will
sequentially select through each possible combination of cd,
tuner, and av inputs, and automatic input switching disabled (cd,
tuner and av indicators off). When the desired inputs selected
for automatic input switching are indicated, stop pressing the
key or button.
To disable automatic input switching, press the
mon
key or
mon
button repeatedly until no input buttons are illuminated.
Automatic input switching only becomes operational or is
cancelled on exiting from program mode by pressing and holding
the handset
prog
key.
17.3 Input Volume Compensation
The NAC 112x incorporates an input volume compensation
system that enables different source component output levels to
be matched.
To program the volume compensation for each input first set the
volume control to a comfortable listening level with the loudest
source (probably CD). Switch the NAC 112x into program mode
as described in Paragraph 17.1. Now select an input to be
adjusted in comparison to the previously selected source and
use the handset
vol up
and
vol down
keys to set an appropriate
volume level. The preamplifier volume control will not rotate
during this operation. Select a further input to adjust if required.
Note:
The front panel volume control cannot be used to adjust
input volume compensation. The handset volume keys only must
be used.
To exit program mode press and hold the handset
prog
key until
the volume control indicator stops flashing.
Note:
Input Volume Compensation can be reset by restoring the
factory defaults. See Section 17.11
17.4 AV Integration (Unity Gain)
The 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 112x inputs. Unity gain can
be selected on the AV input only.
To select unity gain, first switch the NAC 112x into program
mode as described in Paragraph 17.1. 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 remote handset
mute
button. Deselect unity gain by again pressing the handset
mute
button.
Note:
The unity gain feature must be used with care. It effectively
by-passes the NAC 112x 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 handset
preamplifier volume or balance functions are operated while the
unity gain AV input is selected, subsequently selected inputs will be
modified by the new volume or balance settings.
17.5 Handset Volume
The remote handset
vol
keys provides some alternative control
characteristics. A quick press and release of a key will adjust
the volume by a small amount while a press and hold will cause
first slow and then faster adjustment.
17 Installation and Operation
The NAC 112x 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. Diagram 18.3 illustrates the
NAC 112x connected to a Flatcap 2 power supply.
Preamplifier