Sony DVP-NS415 - Manual (Page 64)

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◆ DTS (DVD only)
Selects whether or not to output DTS signals.
Note
When you use the DIGITAL OUT (OPTICAL or
COAXIAL) jack to listen to MPEG audio signals
and set “MPEG” to “MPEG” in “AUDIO SETUP,”
no sound will come from your speakers if you select
one of the TVS modes.
OFF Select this when the player is
connected to an audio
component lacking a built-in
DTS decoder.
ON Select this when the player is
connected to an audio
component with a built-in DTS
decoder.