JBL 4310 User Manual
RECORDING
CONSULTANTS,
INC
.
po.
f,OX 86
KENSINGTON,
MD
. 20795
(301
) 770·7790
The 4310 was developed by JBL
in
cooperation with leading
recording studios
to
meet the need for a powerlul, yet compact,
professional monitor. The ability of the 4310
to
reproduce the full
audible
frequency range at loudness levels required in professiona
work make
it
a perfect
choice
lor control room installations,
small studios,
mixdown
facilities and portable playback systems.
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. 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 transducer, with an effective diameter of 1% inches, gives silky, effortless delineation of high-pitched transients and musical overtone
s.
Enclosure
As
in all
J8L
toudspeaker systems, transducer
s,
electricat network 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 the 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 unrelo
uch
ed
photo Sl
10W5
Ill.
acousllc oul
pu
at
Ihe 5ysilOm
when
Jdv
n
~y
a 50
Wa
ll 51nl:
wave
signa
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laboldlory
..
micropho
ne
was used
10 PI' k up
Itl
ound
from
Model
4310.
The
.,
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rcin
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microphone
.....
,lS
connecled
direclly
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;"In
nscillo-
scope
dnd
the
tl ace pholO
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d
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nlaterr
11
especially
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Even
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1I1i.(1 Ille
43 10
plodllr
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Input sional I alow
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~\Jhst,H1tl3
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14310
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