Operation Instruction VARIODYN
®
D1 Comprio
FB 798666.HO.GB0 / 07.13 17
2.2 Power Amplifiers (PA) 4XD Series
The power amplifiers (PA) serve to amplify the voice/audio signal. Amplifiers are connected to the control
module and also controlled via the control module. The amplifier as well as the cabling is constantly monitored
depending on the configuration.
ERROR
CLIP
CHANNEL
LOW
1
HIGH
POWER
BATT POWER
CPU STATUS
SYS FAULT
MAINS POWER
324
Fig. 10: Front view of power amplifier 4XD125B
ERROR CHANNEL 1 - 4
OFF Normal operation
ON, yellow Fault or overload of the respective amplifier channel
CLIP CHANNEL 1 - 4
OFF Level control of the amplifier channel in the normal range
ON, yellow
Amplifier channel is operating at its limits (e.g. 0.5 dB under full load or signal
level too high - higher amplifier power may be required).
With the two LEDs for “High” and “Low” channel, the range of the detected audio signal level can be displayed
With the factory setting, the range is set to -20 dB (low) to -6 dB (high). The setting is configured via the DIL
switches on the back side of the amplifier.
HIGH CHANNEL 1 - 4
ON, green
The detected level of the audio signal is -3 dB or -6 dB below the expected
nominal level for the high signal. The setting is configured via the DIP switch.
LOW CHANNEL 1 - 4
ON, green
The detected level of the audio signal is -6 dB or -20 dB below the expected
nominal level for the low signal. The setting is configured via the DIP switch.
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