The Becker device's volume control must be set to the AIR Control Display to control the radio's full volume range. Without this setting, the volume cannot be adjusted completely, and the devices are usually either too quiet or too loud.
In the menu of the ACD-57, please do the following:
Go to: BECKER COMM > INSTALLATION > SPK VOL SRC
This setting should be set to “PRI CH”.
If your ACD still has older software (with a different menu structure), you will find this setting under:
MENU > COM SYSTEM > INSTALLATION > SPK VOL SRC
Before accessing it, please enter the PIN code 3000.
With this setting, you define that the ACD has full control over the volume.
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