JBL Synthesis
System
Configuration
24
Center
Systems that utilize a full-range center speaker should select LARGE to
direct center information to the center output with a full frequency
response. Select SMALL for installations where the center speaker is
smaller than the left and right front speakers. This will automatically
engage the Bass Split feature, which takes the low frequency content
from the center and distributes it to the left and right front speakers,
reducing the risk of damage to a small center speaker without loss of
bass information. When SMALL is highlighted, press SELECT to display
and adjust the crossover point for the low frequency redistribution.
Available crossover points are: 40, 80 and 120Hz. Press DONE to return
to the Speaker Configuration menu. This setting should be on SMALL
at 80Hz for ALL JBL Synthesis systems.
Sides
This menu sets the system for your particular side speaker configura-
tion. Systems with side speakers should be designated as STANDARD
(LARGE or SMALL) or DIPOLE (LARGE or SMALL). DIPOLE indicates
a THX speaker configuration, and will work best for dipoles, whether or
not speakers are used. When STANDARD SMALL or DIPOLE SMALL
is highlighted, press SELECT to display and adjust the highpass filter for
the side outputs. Choices are 40, 80 or 120Hz. For any 5.1 channel
inputs, selecting SMALL routes the low frequency information to the
subwoofer output. Selecting NONE mutes the side outputs and directs
all surround information to the rear outputs. This setting should be on
DIPOLE SMALL at 80Hz for ALL JBL Synthesis systems.
Rears
The active selections are LARGE and SMALL. Systems that utilize full-
range rear speakers should select LARGE to direct a full-range signal
to them. SMALL should be selected when filtering is desired. (40, 80 and
120Hz are available as settings for the -3dB point). For any 5.1 channel
inputs, selecting SMALL routes the low frequency information to the
subwoofer output. Selecting NONE mutes the rear outputs and directs
all surround information to the side outputs. When used with JBL
Synthesis systems using side and rear speakers, this setting should be
on SMALL at 80Hz. Otherwise, NONE should be selected.
10
100
50
20
2k
1k
500
200
5k
10k
dBr
Hz
0.0
-1.000
-2.000
-3.000
-4.000
-5.000
-6.000
-7.000
-8.000
-9.000
-10.00
-11.00
-12.00
-13.00
-14.00
-15.00
-16.00
-17.00
-18.00
Bass Split rolls off frequencies at 12dB per
octave. The values given are at the -3dB point
of attenuation from the center speaker.
