a sturdy,
cast
aluminum
frame and suspended
at
its
outer
edge
by a
highly flexible
ring
to
absorb extraneous
sound
waves and allow the long excursion
necessary
to
achieve dynamic range and extend
bass
response.
MIDRANGE
—
The
Decade
36
exhibits
the
midrange
presence
that
is
characteristic
of
all
JBL
systems.
Presence
creates
the
feeling that
a
performance
is
taking place
in
front
of
the
enclosure, rather than coming
from
within
it. The 5-inch midrange transducer
is
noted for
peak-free performance and
uniform
sound distribution,
both
on- and off-axis.
Its
lightweight, curvilinear
cone
is
driven
by a
%-inch diameter copper voice coil
suspended
within
the
strong
field
generated
by a
1%-pound
magnetic assembly. The outer
edge
of
the
cone
is
treated
with
an
exclusive viscous
formulation
that
absorbs
extraneous sound waves traveling through
the
material and eliminates fatigue.
A
metallic center
dome contributes
to
smooth performance
in
the
unit's
upper region.
HIGH
FREQUENCY-Overtones
lying
above
the
range
of
musical fundamentals
are
reproduced
by
the
1.4-inch high frequency direct radiator.
It
utilizes
a
%-inch
diameter copper voice coil and l
5
/s-pound
magnetic assembly. The voice coil
is
large
in
relation
to
cone
diameter for efficiency and transient
reproduction
with
definition
and accuracy. The small
diameter
of
the
cone
and center dome spreads sound
in
a
wide pattern, assuring that
each
listener hears
the
same tonal balance and blend
of
direct and reflected
sound,
regardless
of
position
within
the
prescribed
listening
area. The entire dynamic assembly
is
surrounded
by a
ring
of
dense foam damping material
to
absorb unwanted radiation and reflections.
DIVIDING
NETWORK-Smooth, imperceptible
control
of
the loudspeaker system components
is
achieved
by a
frequency
dividing
network carefully
engineered and tested
to
complement
the
specific
electrical and acoustic characteristics
of
the system.
The
function
of a
precision
dividing
network
is
considerably more' complex than merely feeding low,
midrange
and high frequencies
to
their respective
transducers.
Vitally
important
to
the
total
sound
of a
JBL loudspeaker system
is
the
way the network
distributes
electrical energy for
optimum
control
of
the
system components through
the
transition frequencies.
JBL network component tolerances
are
much more
stringent
than normal industry practices. For example,
the
capacitors used
are
non-inductive, non-polarized
types
with
high
AC
current capacity
built
expressly for
use
in
dividing
networks and
individually
tested for
conformity
to
rigid
performance standards. The special
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