Sony ST-RV444ES Operating Instructions Manual page 34

Selecting a Sound Field
Use the buttons on the front panel to operate the following modes
AUTO FORMAT DECODING
(Press the A.F.D. button)
2 CHANNEL
(Press the 2CH button)
ANALOG DIRECT
(Press the ANALOG DIRECT
button)
Note
No sound is output from the sub woofer when the 2 CHANNEL mode is selected. To listen to two channel (stereo) sources using the front
left and right speakers and a sub woofer, use the AUTO FORMAT DECODING mode.
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Automatically detects the type of audio signal being
input (Dolby Digital, DTS, Dolby Pro Logic, or standard
2 channel stereo) and performs the proper decoding if
necessary. This mode presents the sound as it was
recorded/encoded, without adding any effects.
Outputs the sound from the front left and right
speakers only. Standard two channel (stereo) sources
completely bypass the sound field processing. Multi
channel surround formats are downmixed to two
channels.
The analog input signal is not digitally processed. Only
volume control and the balance between the front left
and front right speakers can be adjusted.
You can use this mode as a reference. Set
the equalizer to OFF while using this mode
to hear the source sound exactly as it was
recorded.
This allows you to play any source using
only the front left and right speakers.
This mode is suitable for the enjoyment of
high quality analog audio sources.