19
ENGLISH
4
AUX A button (with LED)
It turns on (LED is lit) the AUX INPUT A
(its signal is sent to the internal amplifier and PRE OUT).
If activated, the AUX INPUT B signal will be muted (the AUX B button LED will turn off).
The AUX INPUT A signal is always sent to the MUSIC ON HOLD output (that is not affected by
volume control and the AUX A / B buttons).
5
AUX B button (with LED)
It turns on (LED is lit) the AUX INPUT B
(it signal is sent to the internal amplifier and PRE OUT).
If activated, the AUX INPUT A signal will not be sent to the internal amplifier (the AUX A button
LED will turn off).
6
Internal amplifier MASTER volume control
Note: the audio outputs having RCA connectors (MUSIC ON HOLD and PRE OUT) are not
affected by the MASTER volume control.
7
LEDs
0 dB = signal level that allows to get the amplifier maximum power.
The internal ‘limiter’ circuit helps to avoid the amplifier overloading, yet it is advisable to reduce the
MASTER volume (or a single channel volume where a too high signal is present) when the SIG/PK
LED is continuously indicating red.
8
Main POWER switch (0 = off; I = on)
1
2
3
ON
green: the device is switched on
PROT
red: overload protection
orange: thermal protection
PRIOR
yellow: the input 1 and 2 priority function is enabled through
the dip-switch 3 (see 21)
Note: it does NOT indicate the priority activation in progress.
SIG/PK
green: the signal level is higher than – 15 dB
green + red: the signal level is in the 0 ÷ +2 dB range
red (peak): the signal level is equal or higher than +3 dB