JBL S4VC - Manual (Page 14)

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S YMPTOM P ROBABLE C AUSE S OLUTION
No sound coming • Amplifier is not turned on • Turn on amplifier.
from speaker • Amplifier gain is low • Make sure that there is amplifier gain for that channel.
• Correct source is not • Select proper source.
selected or turned on
• Defective patch cords to amplifier • Check/replace patch cords.
• Speaker wires are not • Check speaker wire connection to amplifier.
connected to amplifier
• Balance control is set improperly • Make sure Balance control is set at center,
or 12 o’clock, position.
• Speaker wires are damaged • Make sure none of the speaker wires are frayed, cut
or shorted or punctured. Make sure no wires are touching other
wires or terminals and creating a short circuit.
• Speaker is not configured correctly • In Dolby ® Digital or DTS ® mode, make 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 is 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 www.jblsynthesis.com for further information.
Bass is very weak • Subwoofers are wired out of phase • Make sure that positive terminals on the subwoofers
go to the positive terminals on the amplifiers (red)
and do the same for the negatives.
• Subwoofers have not been placed • Experiment with different locations.
optimally
Poor or smeared imaging • Poor room acoustics • Use absorptive materials to minimize early reflections.
• Aim speakers at listening area.
• Poor program source • Check another program source.
• Improper polarity • Check polarity of wire connections.
Indistinct dialogue • Slap echoes • Add absorption or diffusion materials.
• Miscalibration of center channel • Check output levels of surround processor.
output level
Uneven surround coverage • Poor speaker placement, strong • Place surrounds according to THX specifications.
reflections • Add absorption and/or diffusion materials.
• Excessive absorption near surrounds • Remove absorptive material to provide surround
reflections.
S4Ai diffuse array is out of phase • Phase switch is pressed in with • Push switch out on front panel.
from woofer in Bipole mode Bipole mode selected
T
ROUBLESHOOTING
S4VC/HC/Ai OM 8/19/08 3:26 PM Page 14