Yamaha ATS-B300A User Manual page 65

TROUBLESHOOTING > Audio playback
The volume decreases when the sound bar is turned on
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The Automatic Volume Adjustment function lowered the volume.
To prevent unexpected excessive loudness, the sound bar is equipped with the Automatic Volume
Adjustment function. If the sound bar was turned off with the volume set high, the volume is
automatically adjusted to a safe listening level the next time the sound bar is turned on. Turn up the
volume if necessary.
"Basic control during playback" (p.31)
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