Operation And Usage; Start Up; Input Attenuation - Ecler MPA4-400R Manual De Instrucciones

4. OPERATION AND USAGE

4.1. Start up

To switch the unit on just push the switch labelled POWER (14) and the integrated pilot-light will
light up. We highly recommend the "safe power-up sequence": First the sound sources, then mixer,
equalizers and active filters and, finally, power amplifiers. Powering off should be done by following the
exact reverse sequence in order to avoid any possible peaks reaching the next device, and
consequently protecting the loudspeakers, which are specially sensitive to these peaks.
NOTE: Fully disconnecting the device from mains is done unplugging the power cord from the
mains input socket (37). For this reason, it always shall remain readily operable.

4.2. Input attenuation

These are rotary trimmers located on the front panel (1, 4, 7, 10).
These attenuators allow the connection of different mixers, an independent volume control and the
connection of speakers not able to handle the amplifiers maximum output power, thus avoiding the risk of
damaging them with the mixers or preamps volume control.
Inside the device's packaging you will find a little plastic bag containing transparent caps, which
protect the input attenuation settings from unwanted manipulation. These caps are transparent in order
to let you visualize the current settings.
Once inserted, they cannot be removed with bare fingers, for this purpose, a small screwdriver is
needed.
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