ESC 300 Sub (serv.man3) - JBL Audio User Guide / Operation Manual. Page 3

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If there is no sound from
any of the speakers, check
the following:
• Make sure the subwoofer is
plugged into an active AC
wall outlet.
• Make sure the Master Power
Switch, located on the rear of
the subwoofer, is in the
”On/Standby“ position.
• Make sure there is a 
source – for example, a VCR
or television hooked up to
the video or auxiliary input
jacks.
• Make sure that the program
material is playing.
• Recheck the hookup con-
nections in the ”Speaker
Connections“ section.
If there is no sound from
the surround speakers or 
it is very low, check the 
following:
• Check all connections
between processor/amplifier
and each of the speakers.
• Raise the surround volume
from the remote control (see
“Operation“ section).
• Make sure the TV show or
movie you are watching is
recorded in Dolby Surround. 
If it is not, try the Phantom
or Simulated surround mode.
If there is no sound from
the center speaker, check
the following:
• Make sure that the proces-
sor is in the Pro Logic, 
3 Stereo, or Simulated mode.
If it is in Phantom or Stereo
mode, the center speaker 
will not play.
• Check the connections
between the subwoofer and
the center speaker.
If you have low bass output,
check the following:
• Experiment with placement
of the subwoofer. Remember,
place the subwoofer in a 
corner to get maximum bass
output from the system.
• Increase the level of bass,
using the remote control.
Troubleshooting
Specifications
ESC300 System
Amplifier
200 watts total 
system output; 
front channels: 
35 watts x 3 @ .1% THD; 
surround channels: 
15 watts x 2 @ .1% THD; 
subwoofer: 
65 watts x 1 @ 1% THD
Signal-to-Noise Ratio
90dB
Input Impedance
20k ohms
Input Sensitivity
400mV
Auto Turn-on Sensitivity
2mV/channel
System Frequency 
Response (–6dB)
35Hz – 20kHz
Subwoofer 
Dimensions (HxWxD)
15-1/8 x 13 x 14-1/2 inches 
384 x 330 x 368mm
Weight 
34.5 lbs/15.7 kg
Satellites (each)
Dimensions (HxWxD)
4-3/8 x 3-3/16 x 3-3/4 inches
111 x 81 x 95mm
Weight
.8 lbs/.4 kg 
Occasional refinements may be
made to existing products
without notice, but will always
meet or exceed original 
specifications unless otherwise
stated.
ECS300 Simply Cinema OM  7/21/98 3:06 PM  Page 10
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