Sony 3-284-083-41(1) - Manual (Page 45)

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Types of A.F.D. mode
If you connect a sub woofer
This receiver will generate a low frequency
signal for output to the sub woofer when there
is no LFE signal, which is a low-pass sound
effect output from a sub woofer to a 2 channel
signal.
Note
This function does not work when
– ANALOG DIRECT is selected.
– signals with a sampling frequency of more than
48 kHz is input.
A.F.D. mode
[Display]
Multi channel
audio after
decoding Effect
A.F.D. AUTO
[A.F.D. AUTO]
(Detecting
automatically) Presents the sound as it was recorded/encoded without
adding any surround effects. However, this receiver will
generate a low frequency signal for output to the sub
woofer when there is no LFE signals.
PRO LOGIC
[DOLBY PL]
4 channel Performs Dolby Pro Logic decoding. The source recorded
in 2 channel format is decoded into 4.1 channels.
PRO LOGIC II MOVIE
[PLII MV]
5 channel Performs Dolby Pro Logic II Movie mode decoding. This
setting is ideal for movies encoded in Dolby Surround. In
addition, this mode can reproduce sound in 5.1 channel for
watching videos of overdubbed or old movies.
PRO LOGIC II MUSIC
[PLII MS]
5 channel Performs Dolby Pro Logic II Music mode decoding. This
setting is ideal for normal stereo sources such as CDs.
MULTI STEREO
[MULTI ST.]
(Multi Stereo) Outputs 2 channel left/right signals from all speakers.
However, sound may not be output from certain speakers
depending on the speaker settings.