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Bittner Audio - Application Handbook
3.8.7.
Level Control
To maintain the level/volume structure of the system, independent of the backup switching
condition, it is important to control the level not on the amplifier itself but on the backup switching
unit. This ensures that the level of the faulty amplifier is being applied to the backup amplifier.
Every potentiometer of the amplifier (including the backup amplifier) should be set to the
same value (in standard operation maximum =Unity Gain).
FYI:
If an SXL controls the AX16, all levels will be intelligently adapted. This allows for the use of
amplifiers of different power outputs in the same system.
3.8.8.
ALIVE and ACTIVE Contacts
The condition of an AX16 is indicated by its own ALIVE contact.
In addition, a status contact (ACTIVE) is available which triggers in case of the
activation of the backup amplifier/mode.
In case the mains supply fails, the AX16 (ALIVE contact will open) will fall back into a
safety mode: all signals are directly switched to the amplifier inputs and the amplifier
outputs are directly switched to the loudspeaker outputs. The digital potentiometers are
bridged and the signals are switched without level control. This feature maintains
operation (although somewhat limited) in case of a failure of the backup switching
device.
