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JBL Model 4310 control room monitor
Loudspeaker components
Frequencies up to 1500 Hz are
reproduced
by a
powerfu
t
long
excursion 12" woofer having
a 3-inch
diameter
edgewound
copper
ribbon
voice coit
operating in a magnetic field
of
9,200
gauss
.
The magnet ic
assembly
weighs
six pounds;
free air
cone resonance is
a very low
27
Hz.
The
transition from
the low frequency loudspeaker to the
midrange transducer is made through
a crossover
frequency of
1500
Hz.
Above
thi
s
point,
the
midrange unit provides the clarity
and freedom from distortion required in professionat work, even at
very high loudness
levels.
The husky 5-inch transducer
weighs
2.85
Ibs
.
and
has
a
Va"
diameter edgewound copper ribbon voice coil
operating in a
magnetic field
of
16,500
gauss
.
The
4-inch diameter
edge-damped
cone
operates as
a true
piston
,
giving
smooth
response and wide dispersion
through its operating
range
.
Above 3
kHz
a third direct rad iator gradually
comes
into effect,
reaching full
output
above 7
kHz.
This
ultra-high frequency
trans
ducer, with
an effective
diameter
of 1%
inches, gives
silky,
effort
less
delineation of high-pitched transients and musical
overtone
s.
Enclosure
As
in
all J8L toudspeaker systems,
transducers,
electricat
net
work and
acoustica
l
enclosure
are designed
and
tested to work
together
as a single
integrated system. The
4310 enclosure is
solidly
constructed of %-inch stock
throughout,
with
lock-mitered,
wood-welded joints to prevent unwanted
resonance.
All
loud
speakers are
removable from
th
e
front
of
th
e enclosure
.
The
high frequency
transducers
are mounted
on a
raised auxiliary
baffle for widest possible dispersion, and to suppress cavity
resonances and diffraction effects
.
A ducted port provides added
acoustical loading in the very low frequency range to increase
efficiency and reduce distortion
.
T
his u
n
relo uc hed p hoto Sl10W5 Ill.
acousllc ou
l
pu
at
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5ysilOm
when
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~y
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50
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ll
51nl:
wave
signa
l al
35 Hz
A
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. .
micropho ne
was
used
1
0 PI'
k up Itl
ound
from Model
4310.
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rcin
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ace
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espec ially
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Even
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Cdn be
see
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1I1i.(1 Ille 43 10
plodllr..
'.In
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llril
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ttle Inpu
t
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mo
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mOllltul IJudspcdhels p,o
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14310
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