14 Nac 112 - NAIM NAC 112 - ISSUE 2 Manual

NAC 112
14 Installation and Operation
The NAC 112 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 15.2 illustrates the
NAC 112 connected to a Flatcap 2 power supply.
14.1 inputs
The input selector buttons select the source input signal to
be routed to the power amplifier and the loudspeakers.
14.2 automatic input switching
The NAC 112 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 112 and the CD
on the handset, the NAC 112 will automatically switch to
the CD input.
To enable automatic input switching, first switch the NAC
112 into program mode by pressing and hold
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 112 will return to normal mode
automatically.
If automatic switching is already enabled the front panel
mon button will illuminate. If it is not enabled it can be
switched on by pressing the remote handset
3) or mono (Flash) keys. Automatic input switching only
becomes operational on exiting from program mode by
pressing and holding the handset
14.3 input volume compensation
The NAC 112 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 112 into
program mode as previously described. Now select an input
to be adjusted in comparison to the previously selected
source and use the handset
set the volume to an appropriate level. The preamplifier
volume control will not rotate during this operation. Select a
further input to adjust if required.
To exit program mode press and hold the handset
until the volume control indicator stops flashing.
20
play key is operated
prog from the
mon (Narcom
prog key.
vol up and vol down keys to
prog key
14.4 av integration (unity gain)
The NAC 112 unity gain function enables an audio-visual
processor to be integrated such that the processor's
volume control takes over command of signals connected
to selected NAC 112 inputs. Unity gain can be selected
only on the AV input.
To select unity gain, first switch the NAC 112 into program
mode as previously described. The front panel
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 112 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.
14.5 volume
The remote handset volume
control characteristics. A quick press and release of a key
will adjust the volume by a small ammount while a press
and hold will cause first slow and then faster adjustment.
14.6 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
and re-pressed.
14.7 mute
The mute button silences and restores the output signal.
14.8 record monitor
The mon button operates the tape monitor circuit enabling
the recorded output of a suitably equipped recording device
to be heard.
source mute
key provides some alternative
bal key must be released