Sony DAV-DZ171 Operating Instructions Manual page 61

[ON]: The test tone is emitted from each speaker
in sequence while adjusting the level.
Adjust the sound level as follows.
1
Set the [TEST TONE] to [ON].
2
Press C/X/x/c repeatedly to select the
desired speaker and the level, then
press .
3
Repeat Step 2.
4
Press C/X/x/c to set [TEST TONE] to
[OFF] after adjusting the speaker level.
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