JBL Decade L36 - Service; Summary; For Additional Information

speaker wiring. Power line interference can be further
attenuated by using a heavy duty line interference
filter between the audio power source and the AC
wall outlet.
Acoustic feedback is the result of mechanical
vibrations produced by excessive bass at very high
volume levels. The loudspeaker system can produce
enough energy to vibrate other objects in the room —
including the record player and, by direct mechanical
transmission, the stylus itself. These vibrations are
amplified again and again, producing very loud
"rumble," or even a sustained howl that increases in
intensity as the volume or bass control is turned up.
Possible solutions: 1) locate the speaker cabinets as far
as possible from the turntable, 2) adjust or replace the
turntable shock mountings, 3) place the turntable on a
rubber or sponge mat to further absorb vibrations. If
the low frequency tone is still audible, it is probably
the result of inherent turntable rumble rather than
acoustic feedback.
Should your JBL loudspeaker system require service,
return it to the JBL dealer from whom it was purchased.
If it is not possible to contact a dealer, write directly
to the JBL Service Department describing the difficulty
as fully as possible. Products returned to the factory must
be sent prepaid and will not be accepted unless written
authorization has first been obtained. The warranty
is recognized only when the unit is repaired by JBL
or an authorized JBL Service Agency and if the serial
number of the unit has not been defaced or removed.
In addition to the established five-year warranty, JBL
will, at its option, repair the speakers free of charge
during their entire normal life if factory inspection
discloses an original manufacturing defect. To establish
the warranty, fill out and mail the warranty card within
ten days of purchase.
The Decade 36 exemplifies JBL's reputation for
leadership in acoustic and visual design. It is our sincere
belief that the L36 —like all JBL products— will provide
undiminished listening pleasure for many years to come.
If you have difficulty in achieving the fine
performance of which your JBL loudspeaker system is
capable, consult the JBL Audio Specialist from whom
the system was purchased. He is equipped with the
knowledge required to provide expert advice and
assistance. If for some reason the JBL dealer is unable
to assist you, write directly to the JBL Technical
Information Department explaining the difficulty in
detail.
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FOR ADDITIONAL
INFORMATION