Bedienungsanleitung Naim NAC 152 XS (Seite 19 von 24) (Englisch)

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E17

Preamplifier Operation

14 Preamplifier Operation

Many operational and control features of Naim preamplifiers 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 14.9

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 15 and 16 for more information.

14.1 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, tuner, av and hdd (NAC 152 XS only) 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 mon button (NAC552 mono and NAC 152XS

mute buttons) 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, tuner, av and hdd (NAC 152 XS only) 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

ke y.

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.

14.2 AV Bypass

AV Bypass 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 AV

Bypass 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 AV Bypass, 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 av button) will

illuminate if AV Bypass is selected. If it is not enabled it can be

switched on by pressing the same button twice.

With AV Bypass 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 AV Bypass disabled. When the desired inputs are

indicated, stop pressing the button. The selected inputs will then

be enabled for AV Bypass. The handset can also be used to select

AV Bypass. See table 14.9.

AV Bypass 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: The AV Bypass feature must be used with care. It

effectively by-passes the preamplifier volume and balance

controls leaving any signal connected to an AV Bypass 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 AV Bypass inputs. Additionally, if an

input is selected which has AV Bypass 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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