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8 • English Bose CSP & AVM-1 AutoVolume • Application Guide
PRO.BOSE.COM
Bose CSP-428/CSP-1248
Confirmation/Testing
To ensure that AutoVolume is functioning properly, we recommend the following:
Use a point-source loudspeaker to project ambient noise into the room.
When increasing the volume level of the ambient noise, allow 60 seconds for the algorithm to begin
increasing the volume level of the program audio.
When decreasing the volume level of the ambient noise, allow 120 seconds for the algorithm to begin
decreasing the volume level of the program audio.
When configuring settings in the AutoVolume Calibration section of the Configuration > Listening Areas
page in the CSP Configuration Utility:
Set the Relative Gain to its maximum value of 10 dB.
Increase the volume level of ambient noise in the room until the Relative Gain reaches the Max Gain value.
Reduce the volume level of ambient noise in the room and verify that the volume decreases appropriately.
In general, microphones can detect sound at greater distances and at lower and higher frequency
ranges than the human ear. Vibrations or sounds outside of your hearing range may be detected by the
microphone during calibration, which will cause the volume level of the program audio to be louder than
desired. You can compensate for this by lowering the Relative Gain value.
The AVM-1 sensing microphone’s detection area is limited when it is installed in a low ceiling, as shown in
the following illustrations. When a listening area is more crowded, noise is concentrated in the area closest
to the microphone, which has greater influence over the volume level of the program audio. You can
compensate for this by lowering the Relative Gain setting to a negative value.
High-ceiling installation Low-ceiling installation
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