Sony STR-DA2100ES Operating Instructions for STRDA2100ES Operating Instructions Manual page 22

Note
Although these adjustments can also be made via the
front panel using the LEVEL menu (when the test tone
is output, the receiver switches to the LEVEL menu
automatically), we recommend you follow the
procedure described above and adjust the speaker
levels from your listening position using the remote.
To output the test tone only from
a specific speaker
Set "TEST TONE" in the LEVEL menu to
"FIX" (page 37). The test tone is output only
from the selected speaker.
For more precise adjustment
You can output the test tone or sound source
from two adjacent speakers to adjust their
balance and level.
Set "MENU EXP." in the CUSTOMIZE menu
to "ON" (page 39). Then select the two speakers
you want to adjust using "PHASE NOISE" or
"PHASE AUDIO" in the LEVEL menu
(page 42).
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