CONNECTION
Make the connections with the amplifier and all the components of the audio system switched off and
disconnected from the power supply.
Firstly, connect the audio sources through the AUX inputs 1-2-3.
Connect the microphones to the MIC inputs 1 to 4, and select if you need to apply 48 V phantom power
supply (for condenser microphones) or not (dynamic microphones).
If you wish to record the amplifier output, or connect it to another device, use the MASTER OUT (balanced)
or REC OUT outputs.
Use the low impedance 4 Ω output or the 100, 70 or 50 V line high impedance output, depending on the type
of loudspeakers that you are going to connect. Do not use both types of output at the same time.
If using the low impedance output, you must connect the loudspeakers in a series/parallel circuit so that the
charge impedance of the loudspeakers is the same as the amplifier output impedance and the power
supplied by the amplifier does not exceed that withstood by the loudspeakers.
If using the 100, 70 or 50 V high impedance line output, you must connect all the loudspeakers in parallel and
the sum of the power of all the loudspeakers must not exceed the power supplied by the amplifier.
Once all the connections have been made according to your needs, connect the equipment to the mains and
switch it on. After use, do not forget to switch it off and disconnect the equipment from the mains.
INPUT PRIORITY
The priority function automatically reduces the level of the inputs with less priority so that the message
broadcast through those of greater priority can be clearly heard.
The microphone inputs MIC 1 to 4, together with the chimes and the alarm signal, have maximum priority over
inputs AUX 1-3 and the USB/SD/MP3 player module.
The priority of inputs MIC 1 to 4 is activated with the microswitches MIC PRIORITY located on the rear panel
and is activated when a signal is detected in the corresponding input.
The chimes are activated by contact closure 4-TONE CHIME and GROUND. Likewise, the alarm is activated
by the contact closure DIN ALARM and GROUND.
When the priority is activated the selected aux input automatically attenuates so that the message, warning
or alarm are clearly heard.
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EN
MPA-124U_MANUAL_(EN)_20170306_Maquetación 1 6/3/17 16:52 Página 7
