Samsung PN51D490A1DXZA - Manual (Page 74)

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English
● Dolby Digital Comp ( Line / RF ): This function minimizes signal disparity
between a dolby digital signal and a voice signal (i.e. MPEG Audio, HE-AAC,
ATV Sound).
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.