Focal Professional Alpha Série Manuel D'utilisation page 16

ALPHA
U s e r M a n u a l
ALPHA 50, ALPHA 65 and ALPHA 80 controls and connectors
1 - BALANCED
The XLR inlet permits the connection of a source of balanced signal and follows standard wiring instructions.
Pin 1 = ground (shielding)
Pin 2 = In phase voltage (hot)
Pin 3 = Out-of-phase voltage (cold)
The balanced input is already set on +4dBu sensitivity to match the sensitivity of any balanced audio source.
2 - UNBALANCED
The RCA inlet permits the connection of a source of unbalanced signal. It is common to link the out-of-phase
voltage (Pin 3) to the ground (Pin 1). This connection is generally made on the wires. The unbalanced input is
already set on -10dBV sensitivity to match the sensitivity of any unbalanced audio source.
3 - SENSITIVITY
This switch function is to allow more SPL from the monitor if necessary. The available sensitivities are 0dB and
+6dB. We recommend you to set the sensitivity on 0dB. The +6dB is an interesting solution when you want more
SPL whereas your audio source is already reaching its output limit.
4 - ON/OFF
The ON/OFF switch permits to switch the internal amplifiers ON or OFF. When switching on the monitor, the
standby is activated. To unmute the monitor, send audio signal to the monitor which will detect it and will
automatically unmute the monitor.
5 - STANDBY
The standby LED is off when the power switch is off. It is on when powering on the monitor. As soon as the monitor
is detecting an audio signal, the standby is deactivated and the LED is off. After about 30 minutes without audio
signal, the monitor is automatically muted to avoid unecessary power consumption. When muted, the power
consumption is <0,5W. To unmute the monitor, send audio signal to the loudspeaker. The loudspeaker will require
few seconds to unmute.
6 - LF SHELVING
The LF SHELVING potentiometer permits to activate or not a correction of the sound level under 300Hz. We advise
you to set the LF SHELVING potentiometer on +2dB when the premises acoustics naturally soften that frequency
range. We advise you to set the LF SHELVING potentiometer on 0 when the premises acoustics is neutral.
We advise you to set the LF SHELVING potentiometer on -2, -4, or –6dB when the loudspeakers are placed next
to a wall or an angle.
7 - HF SHELVING
The HF SHELVING potentiometer permits to activate or not a correction of the sound level from 4.5 kHz. We advise
you to set it on +2dB when the premises acoustics naturally softens this frequency range (mat environment).
When the premises acoustics is neutral, 0dB setting is recommended. –2 or –3dB are recommended when the
premises acoustics naturally increases this frequency range (bright environment).
™
8 dB
7 dB
6 dB
5 dB
4 dB
3 dB
2 dB
1 dB
0 dB
-1 dB
-2 dB
-3 dB
-4 dB
-5 dB
-6 dB
-7 dB
-8 dB
100 Hz
10 Hz
1000 Hz 10000 Hz
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