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E28
Preamplifier and Integrated Amplifier Operation
28 Preamplifier and Integrated Amplifier Operation
Many operational and control features of Naim preamplifiers and integrated amplifiers
are common to all and are based on a similar user interface. This section of the manual
describes those features and the user interface, drawing attention to differences between
products where they occur. Table 28.10 sets out some variations in user interface between
products.
Front panel controls are duplicated on the remote control handset which may also
provide some extra functions. See Sections 29 and 30 for more information.
For the purposes of brevity the term preamplifier in the following paragraphs can be taken
also to mean integrated amplifier.
28.1 Automatic Input Switching
With Automatic Input Switching engaged the appropriate
source input will be selected as soon as any handset function
for that (Naim) source component is operated. For example,
if the tuner input is selected and the cd play key is pressed on
the handset, the preamplifier will automatically switch to the
cd input. Automatic Input Switching can be programmed to
operate on any combination of the cd, av, hdd and tuner
input buttons (and sockets to which they are assigned).
To enable Automatic Input Switching, first switch the
preamplifier into program mode by pressing and holding
the handset prog key (with the handset in preamplifier
mode). The front panel source mono/mon button (NAC
202 mon and NAC 152 XS mute buttons, Supernait record
mute button, Nait XS mute button and Nait 5i hdd button)
will illuminate if automatic switching is already enabled. If it
is not enabled it can be switched on by pressing the same
button.
With automatic switching enabled, pressing the button
again will reveal the inputs selected for auto switching
by their indicators illuminating for a short time. Repeated
operation of the button will sequentially select through
each possible combination of cd, av, hdd, and tuner inputs
and auto switching disabled (all indicators off). When the
desired inputs selected for auto switching are indicated,
stop pressing the button.
Automatic Input Switching only becomes operational
on exit from program mode by pressing and holding the
handset prog key.
Note: The preamplifier will leave program mode
automatically if no control commands are received for five
minutes.
Note: In a few cases some further equipment configuration
may be required for auto switching to operate correctly.
Please contact your retailer or local distributor for advice.
28.2 AV Integration (Unity Gain)
Unity Gain enables an audio-visual processor to be
integrated such that its volume control takes over command
of signals connected to selected preamplifier inputs. On the
NAC 552 Unity Gain may be selected on DIN input sockets 4
and 5. On all other preamplifiers it may be selected on only
the av input.
To select Unity Gain, first switch the preamplifier into
program mode by pressing and holding the handset prog
key (with the handset in preamplifier mode). The front
panel source mute button (NAC 202 mute button, NAC
152 XS and Nait 5i av button) will illuminate if Unity Gain
is selected. If it is not enabled it can be switched on by
pressing the same button twice.
Note: Unity Gain (AV Bypass) on the Nait XS is not engaged
in program mode but via a rear panel switch.
With Unity Gain enabled on the NAC 552, pressing the
source mute button again will reveal the inputs selected
by their indicators illuminating for a short time. Repeated
operation of the button will sequentially select each
combination of the available inputs, and Unity Gain
disabled. When the desired inputs are indicated, stop
pressing the button. The selected inputs will then be
enabled for Unity Gain. The handset can also be used to
select Unity Gain. See table 28.10.
Unity Gain only becomes operational on exit from program
mode by pressing and holding the handset prog key.
Note: The preamplifier will leave program mode
automatically if no control commands are receved for five
minutes.
30


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