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6. FUNCTIONING
6.1. Start-up
When the power-on switch is pressed, the blue LED "ON" and the two red LEDs
"PROTECT" (4) light up. About 10 seconds later, all the voltages have stabilized and the
amplifier is operational, and the "PROTECT" indicators go out.
In a complete audio installation it is important to start the equipment according to the
following sequence: sound sources, mixer, equalizers, active filters and finally the power
amplifiers. To stop them, the sequence must be followed in reverse.
6.2. Input attenuators
These devices are governed from the two rotary controls located on the front panel (3).
Their function is to adjust the intensity of the signal received by the amplifier from an
external signal source connected to INPUT 1 / INPUT 2, adapting it to the maximum
level of listening desired and/or supported by the system's loudspeakers.
6.3. Indicators
The eLPA amplifiers provide a simple and effective indication system:
Indicators "PROTECT": They signal the absence of a power signal on the
amplifier's speaker output. They can be activated for different reasons:
1. In the start-up interval, from the moment the power button is pressed until
the end of the starting time necessary to stabilize the amplifier's internal
voltages (approximately 10 seconds).
2. Due to the presence of a short circuit in the output terminals of the amplifier
(crossed cable, damaged loudspeaker, etc.).
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