Samsung UN55F6100AFXZA - Manual (Page 65)

N When Speaker Select is set to External Speaker , the VOLUME and
MUTE buttons will not operate and the sound settings will be limited.
N If there is no video signal, both the TV’s speakers and the external
speakers will be mute.
●
Auto Volume
Normal
equalizes the volume level on each channel, so that when you change
channels, the volume level is the same.
Night equalizes and decrease the volume level on each channel, so each
channel is quieter. Night is useful at night, when you may want to keep the
volume low.
N To use the volume control on a source device connected to the TV, set
Auto Volume to Off on the TV. Otherwise, there may be no change in the
volume when you adjust the volume control on the source device.
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