Naim-audio NAC-N 172 XS User Manual download pdf (Page 30)

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.

Note: The Unity Gain feature must be used with care. It

effectively by-passes the preamplifier 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. In order to reduce the potential for inadvertent

mishap, any subsequent modifications to input assignment

will automatically disable previously set up Unity Gain inputs.

Additionally, if an input is selected which has Unity Gain

enabled, the preamplifier 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.

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