Yamaha YSP-1 Owner's Manual page 54

You can adjust the output level of each speaker to achieve a more true-to-life surround sound experience. You can adjust
the sound beam output levels for each beam mode.
You can use the test tone feature to output a test tone from
each speaker to manually balance the speaker levels.
Use the test tone to set speaker levels, so that the volume
from each speaker is identical when heard from your
listening position.
3
Press _ / D to adjust speaker volumes.
Adjustment range: -10 dB to +10 dB
._j,-',)
,...
Before proceeding to the next step, adjust the volume
level of this unit using VOLUME +1- on the remote
control.
2
Press TEST.
"TEST LEFT" appears in the front panel display, and
a test tone is output from the front left speaker.
TEST
%
Press _ / v to select the speaker you want
to adjust.
4
Press TEST when you have completed your
adjustment.
TEST
%
To adjust the output level of your subwoofer, set BASS OUT to
BOTH o1"SWFR (page 38).
48