S
YMPTOM
P
ROBABLE
C
AUSE
S
OLUTION
No sound coming
• Amplifier not turned on
• Turn on amplifier.
from speaker
• Amplifier gain is low
• Make sure that there is
amplifier gain for that channel.
• Correct source not
• Select proper source.
selected or turned on
• Defective patch cords to amplifier
• Check/replace patch cords.
• Speaker wires not
• Check speaker wire
connected to amplifier
connection to amplifier.
• Balance control set improperly
• Make sure Balance control is set
at center, or 12 o’clock, position.
• Speaker wires damaged
• Make sure none of the speaker wires
or shorted
are frayed, cut or punctured. Make sure
no wires are touching other wires or
terminals and creating a short circuit.
• Speaker not configured
• In Dolby
®
Digital or DTS
®
mode, make
correctly
sure that the receiver/processor is
configured so that the speaker in
question is enabled.
• Center speaker is configured
• In Dolby Pro Logic
®
mode, make sure the
incorrectly
center speaker is not in phantom mode.
• Problem not diagnosed
• To diagnose the likely source of the
problem, it is often helpful to switch the
nonfunctioning speaker with one that
is functioning correctly. Turn off all
electronics before exchanging the
speakers. Turn everything back on, and
determine whether the problem is in
the same place, or has moved with the
speaker. If the problem is in the same
place, the source is most likely with your
receiver or amplifier. If the problem has
followed the speaker, then contact your
authorized JBL Synthesis custom installer
or dealer for further assistance. If that
is not possible, visit our Web site at
www.jblsynthesis.com for further information.
Bass is very weak
• Subwoofers are wired out
• Make sure that positive terminals on the
of phase
subwoofers go to the positive terminals
on the amplifiers (red) and do the same
for the negatives.
• Subwoofers have not
• Experiment with different locations.
been placed optimally
T
ROUBLESHOOTING
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