Samsung UE50ES6300U E-Manual page 161

N
Select Line to obtain dynamic sound,
and RF to reduce the difference
between loud and soft sounds at
night time.
Line: Set the output level for signals
greater or less than -31dB (reference)
to either -20dB or -31dB.
RF: Set the output level for signals
greater or less than -20dB (reference)
to either -10dB or -20dB.