Bose FreeSpace E-4 Owner's Manual page 57

8. Click Continue to begin the source calibration process.
The source calibration process takes about three minutes
per source. For each source, the input gain is measured and
optimized, and the source level is activated. When this is
done, the software displays the following confirmation.
6.0 E-4 System Setup
9.
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Click Continue to begin the Zone Microphone Calibration.
This calibration is performed using a test signal at the maxi-
mum zone volume and takes about 5 minutes.