ESC 550 Source (serv.man16) - JBL Audio User Guide / Operation Manual. Page 15

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1. Dolby Pro Logic – In this
mode all five speakers are used.

2. Dolby Pro Logic Phantom –
In this mode the center 
channel does not operate.
This may be preferred when
listening to a music source that
was not recorded with surround
channel information.

3. 2-channel – In this mode the
program is played back in a
traditional stereo form.

Dolby* Pro Logic* is an
encode/decode process by
which four channels of
soundtrack information are
encoded into two channels for
playback on VCRs, laserdisc
players, and some TV
broadcasts, and then decoded

back into four 
channels for playback through
five loudspeakers. Remember
that a Dolby Pro Logic system
consists of three channels of
information for front left, 
center, and right speakers and
one channel of mono surround

information. The surround
channel is played back through
two speakers. Dolby Pro Logic
helps to re-create all of the
impact and excitement of a
movie theater in your home.

To switch between the three
surround modes: Push
“Surround Mode.” on The Source
or 

the remote control.

If you are listening to a program
in the Dolby Pro Logic Normal or
Phantom mode 
and you wish to turn off the
surround speakers:
Push “Rear Speakers” on 
The Source.