Onkyo TX-NR545, Manual

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2" is set to "Yes" and Zone2 is set to on.
Surround Left
Default Value: 0 dB
Select a value between "­12 dB" and "+12 dB". A test tone will be
output each time you change the value. Select the desired level.
Subwoofer
Default Value: 0 dB
Select a value between "­15 dB" and "+12 dB". A test tone will be
output each time you change the value. Select the desired level.
The speaker "Level Calibration" may be unable to be changed depending
on the settings in "Configuration" ­ "Speaker Channels" / "Subwoofer".
"Level Calibration" cannot be changed while muting is on.