Replacement
-Reverse the removal procedure to replace
the system components. Mounting screws should be tight-
ened evenly and just enough to avoid air leaks between the
components and the enclosure.
M a i n t e n a n c e
The grille cloth is a double knit polyester fabric selected for
acoustic transparency, beauty, physical strength, color fast-
ness and soil resistance. It can be cleaned by gently dusting
it with a vacuum cleaner. Stains can be removed by using
aerosol cleaners, such as Texize
K2i:
Goddard's
Dry Clean.
or Pen Champ
Quick n Easy,
according to each manufac-
turer's instructions.
Warning: Cleaning fluids or other solvents should not be used.
Although they may appear to remove a stain, liquid cleaners will
dissolve the base paint on the grille frame beneath the cloth,
resulting in permanent discoloration of the material.
Occasional dusting with a clean, soft cloth will maintain the
finish of the enclosure. Since both the textured gray and oiled
walnut surfaces are moisture resistant, a damp cloth will
remove most stains. Mild detergent may be used on the gray
finish to remove smudges or more persistent stains. Con-
ventional furniture waxes or polishes should not be used:
the oiled walnut enclosure, however, may be treated with
wax specifically formulated for such surfaces.
The walnut finish may appear to age. or dry out. as the oil
penetrates deeper and deeper into the veneer. It may, there-
fore, be desirable to re-oil the enclosure surface from time
to time. With each application, the beauty of the finish will
become more obvious, and a warm, rich patina will eventually
be obtained.
To re-oil a JBL oiled walnut finish, use any one of the
several clear oil finishing preparations available through
furniture or hardware outlets. Apply a liberal amount of the
preparation over the entire finished surface of the enclosure.
In ten to fifteen minutes wipe off the remaining oil with a soft,
clean, dry cloth. Small surface scratches can usually be
removed by gently rubbing them out with very fine steel
wool (4/0 grade) and applying oil to the entire panel. Very
deep scratches, dents or other serious damage should be
repaired only by a qualified furniture refinisher.
Caution: Improper storage of wiping rags could result in spon-
taneous combustion. They should be thrown away or spread out
to dry in a well-ventilated area before storage or disposal.
A d d i t i o n a l I n f o r m a t i o n
JBL maintains a technical staff to answer questions pertain-
ing to professional sound reinforcement. Detailed technical
information on JBL products is available from the same
source. Inquiries may be addressed to the Applications
Engineer, Professional Division, James B. Lansing Sound,
Inc., 3249 Casitas Avenue, Los Angeles, California 90039.
5
Low Frequency
Midrange
High Frequency
While
Black,
Red
Black
Red
Green
Black
Terminal Posts
(rear
at
enclosure)
Red
Red
Black
Black
Dividing Network
When reconnecting the wire leads between the network, input
terminals and high frequency direct radiator, proper polarity is
assured by the connectors. Connections to the other components
are color coded as shown.
Interior view of the 4311.