Sony HT-DDW990 - Manual (Page 37)

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To avoid damaging your
speakers
Before you turn off the receiver, be sure to turn
down the volume level.
To listen to the sub woofer
Be sure to use the buttons on the sub woofer
for this operation.
1 Press POWER.
The POWER indicator lights up.
2 Turn LEVEL to adjust the volume.
Set the volume level to suit your preference
according to the selected input as slight
adjustments may enhance the sound.
Note
Do not set the volume of the sub woofer to
maximum as extraneous noise may be heard.