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MULTICHANNEL POWER AMPLIFIER V1.1 web
connecting it to the mains is dangerous and likely, it blows the mains fuse of the rack power supply
when available. In a rack of power amplifiers, switch the power amplifiers on in a
one by one basis.
Note that upon switching the power amplifier on, the ON/PROTECT indicator
blinks (indicating that the power amplifier is cutting the output signal), and after a few
seconds this green doesn’t blink, it light up and a RELAY click will be listened indicating that the power
amplifier is connecting the output signal to the loudspeakers. At this time, we can turn up the power
amplifier input attenuators.
INPUTS ATENUATORS
Each power amplifier channel has an input signal attenuator.
The input attenuators are independent for each channel. In BRIDGE mode, both
channels depend on the odd (CH1, CH3, CH5, CH7) input attenuator.
CLIP INDICATORS (INPUT SIGNAL OVERLOAD)
The CLIP red
LED, light on when the power amplifier starts to saturate, moreover, if
the limiter is ON, this LED indicates that the circuit limiter starts to work, for more information see
section
SPECIAL OPERATIONS - LIMITER ON/OFF
The CLIP indicators are independent for each channel, indicate a real saturation.
The CLIP indicators also light on when there is an output short-circuit, whenever one input
signal is being introduced to the power amplifier.
We must avoid this situation of overload during extended periods, to make the loudspeakers
life longer.
If the input signal level is too high, don't turn the power amplifier limiter off, because it is an
efficient protection for the loudspeakers.
In general, the loudspeakers resist high peaks of instantaneous power, but when exposed to
extend overload situations they lose any guarantee of good operation.
SIGNAL INDICATORS
The SIGNAL
green LEDs illuminates when the output signal of the corresponding
channel reaches approximately -35 dBu before saturation.
These LEDs indicate signal presence in the power amplifier output.
ON/PROTECT INDICATORS
The
ON/PROT green LED shows three working states:
Amplifier off, protection mode, amplifier working
