JBL
Model
4310
control
room
monitor
Loudspeaker components
Frequencies up
to
1500
Hz
are reproduced by a powerfut long-
excursion
12"
woofer having a 3-inch diameter edgewound
copper ribbon voice coit operating
in
a magnetic field of 9,200
gauss. The magnetic 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.
Th
e 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, transducer
s,
electricat net-
work and acoustical 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
un
relo
uch
ed
photo Sl
10W5
Ill.
acousllc
ou
l
pu
at
Ihe 5ysilOm
when
Jdv
n
~y
a 50
Wa
ll 51nl:
wave
signa
l al 35 Hz A
laboldlory
..
micropho
ne
was
u
sed
10 PI' k up
Itl
ound
from
Model
4310.
The
.,
sign<ll f
rcin
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microphone
.....
,lS
connecled
direclly
to
;"In
nsci
l
lo-
scope
dnd
the
tl ace pholO
rilpll
d
Susla
i
ned
p"dOrmal11 e
al
IhlS Inl
enslly
',(Ju
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not
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encoun
l
erpJ
J
urinq
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ma
l
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01
ourse
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50
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e
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drfflclli
t
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50
watts
prog
r
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nlaterr
11
espec
i
ally
rn
the
v
Iy
lov.
fro
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range
Even
so It Cdn
be
seen
1I1i.(1
I
lle
43 10
plodllr
..
'.In
tlrno~t
per
l
ect
rep l
lril
tJf
ttle
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t
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I
alow
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HI
mo I
mOllltul
IJudspcdhels
p,o-
dure
~\Jhst,H1tl3
l
distal
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m[lll
i J
L
oudsped"el
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nenls
of
M
d,'
14310
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