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English • 7Application Guide • Bose CSP & AVM-1 AutoVolume
PRO.BOSE.COM
Bose CSP-428/CSP-1248
Relative Gain Oset (Advanced)
The Relative Gain Oset value sets the baseline volume level of the listening area. Adjusting this value
increases or decreases the overall volume in the listening area.
Note: The Relative Gain Oset value is determined by the AutoVolume calibration algorithm. This advanced
setting can be adjusted, but it should be used with caution.
To adjust the Relative Gain Oset value:
1. Complete the AutoVolume calibration procedure as described in AutoVolume Calibration (Page 5).
2. Play program material in the AutoVolume listening area.
3. Adjust the Relative Gain setting (in the AutoVolume Calibration section of the Configuration > Listening
Areas page) to increase/decrease the overall volume in the listening area. Alternatively, if you have set up
a ControlCenter digital zone controller for the listening area, you can use it to adjust the relative gain.
Notes:
Adjustments should be made in increments no larger than 3 dB.
Adjustments will take eect after a set amount of time, as follows:.
Increasing gain takes 60 seconds.
Decreasing gain takes 120 seconds.
Wait one to two minutes after adjusting the gain to ensure it is within the appropriate range.
4. When you are satisfied with the volume level of the room, apply the Relative Gain value to the Relative
Gain Oset value. For example, if you adjust the Relative Gain to +3.0 and the calibration results in a
Relative Gain Oset of −16.5, then you would change the Relative Gain Oset to −13.5.
i. Click Advanced (next to the Recalibrate button).
Note: The Advanced setting appears only after the AVM-1 microphone
in the selected listening area has been calibrated and the toggle is set to
AV: ON.
The Relative Gain Oset window appears.
ii. In the Relative Gain Oset window, use the up/down arrows or type
directly into the text box to specify the Relative Gain Oset.
iii. When you are finished, click Close.
Note: Use caution when adjusting the Relative Gain Oset. Increasing the Relative Gain Oset allows the
user to increase the Relative Gain from −10 to +6 dB. Setting the Relative Gain Oset too high can lead
to a situation in which the user can adjust the Relative Gain too high as well. This can cause the system
to “run away” (program audio continues to increase until the Max Gain setting is reached, and may not
decrease in level until the system is restarted). This occurs when the microphone detects the program
audio from the loudspeakers at a level that is higher than the ambient noise level.
Recalibration
Recalibrate AutoVolume compensation if any of the following items change:
the location of an AVM-1
the listening area’s physical layout or acoustic dampening
the model or position of any loudspeaker in the room
the equalization of a loudspeaker or equalization of a listening area
the firmware of the Bose CSP
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