SoundMax SM-CMD3005 - Manual (Page 27)

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Speaker setup
LT/RT: The audio out is Left and Right channels format even if the
original sound is 5.1CH format.
Stereo: The audio out format is stereo even if the original sound is 5.1CH
format.
VSS: The audio format Advanced Virtual Surround Sound
Digital setup
OP MODE
Select the output mode: Line out, RF remode.
DYNAMIC RANGE
If watching large dynamic scope movie program at night, to select this
mode you can reduce the volume to a very low level, at the same time, to
keep the fine details sounds. In this case, this doesn't disturb the family
and keep the quality sounds.
DUAL MONO
Stereo: stereo output signal.
Mono L: left output signal.
Mono R: right output signal.
Mix Mono: left and right output average signal.