5
SUBWOOFER PLACEMENT & OPERATION
Subwoofer
Start with the subwoofer as
close to one of the front
corners as possible to take
advantage of solid-angle gains.
If you get too much bass, adjust
the ”VOLUME” towards ”MIN”.
The result will be lower distor-
tion and higher reliability. If the
excessive bass is at one or
more discrete frequencies,
then it might be necessary to
consider dealing with room
modes.
Here are your options:
• Modify the acoustical cou-
pling of the subwoofer to the
room boundaries i.e. move the
subwoofer.
• Modify the acoustical cou-
pling of the listener to the
room boundaries i.e. move the
listener.
• Move both the subwoofer and
the listener.
Danger: Low Power
Loudspeakers can withstand a
great deal of power as long as
the sound is undistorted. You
can safely use a power amplifi-
er with a power rating greater
than the loudspeaker system’s
rated power, as long as the
sound reproduced is clean and
undistorted. When the power
output of the amplifier is
exceeded, distortion sets in. A
large share of these distortion
products is directed to the
tweeter, creating a dangerous
situation for the smallest driver
in the system. The smaller the
amplifier or receiver you use,
the bigger the danger of
overdriving the amplifier and
the greater the potential danger
to the high frequency unit. The
best advice is always to use an
amplifier or receiver that will
make your speakers play loud,
clean and undistorted.
General Care
and Service
Occasional dusting with a
clean soft cloth will maintain
the original beauty of the finish
of your JBL speakers. Furniture
waxes, polishes or cleaners are
not recommended. The grille
may be gently vacuumed, and
stains can be removed with an
aerosol dry cleaner. Never use
any solvent to clean any part of
the system. Should your loud-
speaker system ever need ser-
vice it should be returned to
the JBL dealer where it was
bought. If this is impractical,
contact your local JBL
distributor.
