Introduction
2.7 service and updates
It is essential that repairs and updates are only carried
out by an authorised Naim retailer or at the factory by
Naim itself. Many components are custom made, tested
or matched and appropriate replacements are often
unobtainable from other sources.
NAC 122x
3 Installation and operation
The naC 122x 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 4.3 illustrates the naC 122x
connected to a Flatcap 2x power supply.
3.1 Input sockets
The input selector buttons select the source input signal
to be routed to the preamplifier outputs and the power
amplifier.
The NAC 122x has six DIN input sockets and two alternative
pairs of RCA Phono sockets. The RCA Phono sockets are
permanently connected to the CD and AUX 2 inputs
in parallel with their DIN sockets. RCA Phono and DIN
sockets for the same input should not be connected
simultaneously.
3.2 subwoofer output
The NAC 122x provides an analogue subwoofer output via
a pair of RCA Phono sockets.
note:
The subwoofer output is a duplicate of the main
preamplifier output.
3.3 automatic Input switching
The NAC 122x 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 122x and the CD play key is
operated on the handset, the NAC 122x 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
122x into program mode by pressing and holding the
prog
key of 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 122x will return to normal
mode automatically.
Once in program mode, 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.
3.4 aV Integration (unity Gain)
The NAC 122x 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 122x inputs. Unity gain can be selected on the AV
input only.
To select unity gain, first switch the NAC 122x into program
mode as described in Section 3.3. 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 becomes operational on exiting from
program mode by pressing and holding the handset
prog
key.
Direct contact to Naim for service or update information
should be made initially through Customer Services:
Tel:
+44 (0)1722 426600
Email:
Please quote the product serial number (found on its rear
panel) in all correspondence.
