15
MULTICHANNEL POWER AMPLIFIER V1.1 web
ENABLED 100 HZ HIGH PASS FILTER
EARTH LIFT
In some installations, it might be necessary to isolate the power amplifier input signal electric
ground, from the system mains earth, in order to avoid ground loops, that could generate unwanted
noises. For this reason, the power amplifier provides an EARTH-LIFT switch placed at the rear panel to
lift the mains earth from the power amplifier pair 1-2 (3-4, 5-6 and 7-8) input signal electric ground.
MAINS EARTH LINK TO THE POWER AMPLIFIER PAIR 1-2 (3-4, 5-6 AND 7-8)
MAINS EARTH LIFT FROM THE POWER AMPLIFIER PAIR 1-2 (3-4, 5-6 AND 7-8)
CAUTION:
Sometimes, lifting the mains earth, by using a ground-lift connector,
cancels some hum noises on the audio system, but this is very dangerous and not
advisable, because should any circumstance part of the mains signal is derived to
the chassis, could cause a short circuit through our body, upon having eliminated
one of the working precautions of the unit. For this circumstance,
NEVER
lifts the
mains earth (use the EARTH-LINK switch of the unit) in order to avoid possible accidents.
.
6. OPERATION
POWER UP
Plug in all inputs and outputs connectors (following the recommendations of the
sections INSTALLATION
- OUTPUT POWER CONNECTION. MODES OF OPERATION
. Ensure
that both power amplifier input attenuators are turned fully counter-clockwise (-
∞
position).
At this time, we can switch on the power amplifier.
Upon switch the power amplifier on, the delay turn on system takes place that
minimises the effect of the transient currents on the loudspeakers. In a few seconds, the delay turn on
system stops working (a RELAY click will be listened) and the load is connected.
When turning on a rack of power amplifiers they should be switched on individually. The
practice of leaving all power amplifiers in a rack switched on and powering up the whole rack by
