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Power Capacity
Live performance conditions can place incredible d e m a n d s
on even the best musical sound systems. High power levels,
use of controlled distortion, wide instrumental dynamic
range, and explosive transients continuously challenge a
system's reliability.
Because these conditions are so severe, we prefer the
"Continuous Sine Wave" method of rating the power capacity
of J B L sound systems. This laboratory standard test is far
more demanding than actual performance situations and
provides a credible measure of a systems power capacity.
Since a n u m b e r of manufacturers continue to use the less
stringent "Continuous Program Power" rating, we have
included these figures for your reference.
When making an amplifier selection you should be aware
of the fact that a severely distorted signal can place very high
d e m a n d s on a speaker. In fact, under s o m e conditions a
distorted 75 watt signal may d a m a g e a speaker m o r e easily
than an undistorted 150 watt signal. Because of this, amplifier
distortion levels must be taken into consideration when
you select an amplifier for use with a Cabaret system. In
applications where high distortion is expected [such as a
guitar system) it is best to use only those amplifiers whose
ratings fall well within the speaker system's "Continuous Sine
Wave" power capacity.
Component Removal
Each Cabaret Series system is supplied with all c o m p o n e n t s
installed, wired, and tested. Access to the c o m p o n e n t s should
not be required under normal usage. If access is needed,
note that the enclosure is filled with fiberglass, which can be
irritating to the skin. It is r e c o m m e n d e d that long sleeves
and gloves be worn for protection when working in contact
with the fiberglass.
To remove the c o m p o n e n t s , the enclosure should be placed
on its back.The grille should then be removed as described
under the section of this manual concerning nameplate
reorientation. All cone speakers are m o u n t e d f r o m the front
of the baffle board with machine screws threaded into T-nuts
on the rear of the board. High frequency drivers are mounted
from the rear of the baffle board with machine screws
threaded into tapped holes in the mounting flanges of the
drivers. When removing the screws, do not apply pressure
which might dislodge the T-nuts. Note the color coding of the
wiring carefully before removing the wires from the trans-
ducers so that they may be properly connected when
reassembling the system.
5
The dividing network in the 4680 is m o u n t e d on the rear
of the baffle board with machine screws going through the
board into fasteners on the network. Access to the network
is gained by removing the transducer closest to the high
frequency assembly.
The dividing network in the 4602 is m o u n t e d in a similar
manner but is mounted on two boards: one on the rear
of the baffle board and one located on the side of the en-
closure. Access to the network is gained by removing the
cone transducer.
Replacement of the system c o m p o n e n t s is done by reversing
the removal procedure. Mounting screws for all devices
should be tightened evenly and just e n o u g h to prevent air
leaks.
Enclosure Maintenance
The Cabaret Series enclosures are finished in an unusually
durable black polyurethane material. Simple cleaning can be
accomplished with a d a m p cloth. If additional lustre is desired,
treatment with a silicone-based product is r e c o m m e n d e d .
While the enclosure's nylon grille should not require any
regular maintenance, it may be cleaned by gently dusting it
with a v a c u u m cleaner.
J B L continually e n g a g e s in research related to p r o d u c t i m p r o v e m e n t . N e w
materials, p r o d u c t i o n m e t h o d s , a n d d e s i g n refinements are i n t r o d u c e d into
existing p r o d u c t s w i t h o u t notice as a routine expression of that philosophy. For
this r e a s o n , any c u r r e n t J B L p r o d u c t may differ in s o m e respect f r o m its
p u b l i s h e d d e s c r i p t i o n but will always equal or exceed the original d e s i g n
specifications unless o t h e r w i s e stated
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