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NAC 552

The remote handset

mono

(Flash) or

mon

(Narcom 3) 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.

5.5 AV Integration (Unity Gain)

The NAC 552 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 552
inputs. Unity gain can be selected on input sockets 4 and 5
only (the corresponding input buttons will depend on the input
mapping set up).

To select unity gain, first switch the NAC 552 into program mode
as described in Paragraph 5.2. The front panel source mute
button will illuminate if unity gain is selected on any input. If it is
not enabled it can be switched on by pressing the

source mute

button twice.

With unity gain enabled, pressing the

source mute

button

again will reveal the inputs selected by their button indicators
illuminating for a short time. Repeated operation of the

source

mute

button will sequentially select each combination of Input

4, Input 5 and unity gain disabled. When the desired inputs are
indicated, stop pressing the source mute button. The selected
inputs will then be enabled for unity gain. The remote handset

mute

key can also be used to set up unity gain.

Unity gain only becomes operational on exiting from program
mode by pressing and holding the handset

prog

key.

Note:

The unity gain feature must be used with care. It effectively

by-passes the NAC 552 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 mapping will automatically disable previously set up unity
gain inputs. Additionally, if an input is selected which has unity gain
enabled, the NAC 552 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.

5.6 Handset Volume and Balance Control

The remote handset

volume

and

balance

keys provide some

alternative control characteristics. A quick press and release of
a key will adjust by a preset “nudge”. A quick press and release
of a key followed by press and hold will cause continual slow
adjustment. Simple press and hold will cause continual fast
adjustment.

5.7 Mute and Mono

Mute and mono functions can be controlled independently for
source and record signals via the front panel buttons to the left
of the two banks of source and record selection buttons. Mute
silences the output signal, while mono sums the left and right
channels.

5.8 Display

The NAC 552 front panel button display can be switched off
by pressing the remote handset (in preamplifier mode)

disp

function. Any subsequent handset or front panel operation will
temporarily restore the display. A second operation of the

disp

function will permanently restore the display.

5.9 Switch-on

After switch-on, via the NAC 552PS front panel

power

button,

the NAC 552 will remain muted for 30 seconds while control
systems and circuits stabilise. The source side will then un-mute
automatically leaving the record side muted (and its circuits
unpowered).

5.10 Remote Control

The

Flash

remote handset supplied with the NAC 552 duplicates

all configuration and control functions. See Section 23 for more
information. The

NARCOM

and

iCom

handsets will also control

the NAC 552. See Sections 24 and 25 for more information.

5.11 Defaults

To restore all programmable settings to the factory defaults
press and hold the remote handset