DOWNLOAD JBL ESC 550 Source (serv.man17) Service Manual ↓ Size: 538.67 KB | Pages: 24 in PDF or view online for FREE

– 17 –

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 sound-
track information are encoded
into two channels for playback
on VCRs, laser disc 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 pro-
gram in the Dolby Pro Logic
Normal or Phantom mode 
and you wish to turn off the
surround speakers:
Push “Rear Speakers” on 
The Source.

This system contains three surround modes.

+

–

ESC550 Simply Cinema OM  7/22/98 4:34 PM  Page 17

– 18 –

For proper Dolby Pro Logic
operation, a test tone is used
to calibrate the volume set-
tings of the speakers. A noise
will be heard cycling, in order,
from the front left, center,
right, and both surround
speakers.

Using the remote control, push
“Tone.” Then adjust the Center
and Surround levels until the
volume of all the speakers is
the same during the test.
Note: The test tone is used to
calibrate the performance of
the system. When listening 
to an actual recording, the

volume level of the surround
channels is generally much
lower than that of the front
channels. In fact, when 
listening to a movie, virtually
all of the dialogue and a sub-
stantial number of the effects
are reproduced through the
center channel.

+

–

+

–

+

–

Push “Calibrate” on the
remote control until “Balance”
appears in the display.

Push “+” on the remote 
control to adjust the balance
toward the right speaker.

Push “–” on the remote 
control to adjust the balance
toward the left speaker.

+

–

+

–

+

–

Push “Calibrate” on the
remote control until “Center”
appears in the display and the
corresponding LED on top of
the display is lit.

Push “+” on the remote 
control to increase the volume
of the center channel.

Push “–” on the remote 
control to decrease the 
volume of the center channel.

+

–

ESC550 Simply Cinema OM  7/22/98 4:34 PM  Page 18

– 19 –

TM

+

–

+

–

ESC550 Simply Cinema OM  7/22/98 4:34 PM  Page 19

– 20 –

+

–

+

–

+

–

Push “Calibrate” on the
remote control until “Rear”
appears in the display and the
corresponding LED on top of
the display is lit.

Push “+” on the remote con-
trol to increase the volume 
of the rear channels.

Push “–” on the remote 
control to decrease the 
volume of the rear channels.

The delay control allows the
user to set the surround delay
between 15 and 30 milli-
seconds in 1 millisecond incre-
ments. The best setting will
depend on the distance
between the main listening

area and the front speakers as
well as the distance between
the main listening area and
the rear speakers. 
The chart at the bottom shows
the recommended settings.

Distance (in feet) From Front Speakers

Distan

ce (in feet) Fr

om Rear Speak

ers

Preferable            Acceptable

+

–

+

–

+

–

Push “Calibrate” on the
remote control until “Delay”
appears in the display and the
corresponding LED on top of
the display is lit.

Push “+” on the remote 
control to increase the 
delay time.

Push “–” on the remote 
control to decrease the 
delay time.

ESC550 Simply Cinema OM  7/22/98 4:34 PM  Page 20