Adjusting the master volume
Turn the volume control knob to adjust the volume.
The volume level appears on the display.
You can also press VOLUME 
on the remote control unit for this operation.
You can adjust the volume level to --- dB (minimum) and between -90 dB and 0 dB.
Turning off the sound temporarily (muting)
You can also press 
on the remote control unit.
on the remote control unit.MUTING is displayed on the display.
Press again to cancel the muting.