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2420 - JBL Professional
Nominal impedance shall be 16 ohms and power capacity shall be at least 30 ... submitted data from a recognized Independent test laboratory verify that the ...
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Model 2420 is a professional pression
flat response.
concentric
determined exponential
cancellations.
The magnetic
to tolerances
considered
The aluminum
of precision.
plug consists of
horns to eliminate
assembly
impractical
alloy diaphragm
shape in order to eliminate
phasing
com-
wide range and
It is built to typical JBL standards
The mathematically machined
quality high frequency
driver which has an exceptionally
is pneumatically
ring of pure silver surrounds the Inductance
After manufacture,
the frequency
IS tested for conformity
the pole piece to
of the voice co11at high frequencies. response
of each driver
to rigid performance
standards
phase
is cast and machined by industry
machined counteract
standards. drawn to
stresses that cause fatigue. A
The 2420 is ideally suited for critical playback reinforcement
and power capacity free response out acoustic
systems or
systems of the highest quality. Its high efficiency permit great dynamic
range. The peak-
of the 2420 allows greater system gain withfeedback.
Model 2420-Compression Architectural
Specifications
The compression encased
driver shall consist of an AlnicoV
in a cast iron return circuit. All magnetic
parts shall be machined No stamped
from cast or extruded
or ceramic
plug shall be assembled horns to eliminate coupled
Driver
1 inch in diameter.The with reinforcing
parts shall be used.The
phasing exponential
concentric
and it shall be further
throat, the mouth of which shall be back cover shall be cast aluminum
ribs to prevent
ringing
resonances
cause peaks in response. The diaphragm aluminum
alloy pneumatically
stressesThe
shall be 0.002”
voice coil shall be edgewound
controlling
of notlessthan
ring, machined
aluminum
Performance
operating
19,OOOgaussAn
in
impedance
of pure silver, shall be affixed to
the pole piece in order to increase cies and maintain
which
drawn to shape to prevent
ribbon of not less than 1.75 inches in diameter, a magneticfield
assembly
billet stock.
of machined
phase cancellations,
to a tapered
magnet
efficiency
at high frequen-
flat response.
specrftcatrons
of a typrcal productton
unit shall
be as follows Measured
sensitivity
at 1 mW on a terminated
of 1 inch diameter, an indication
of electromechanical
BI factor shall be at least 10.3x Frequency
tube basis (tube
3.0 feet long) shall be at least 118 dB. As
response,
measured
conversion
efficiency,
the
106dynes/abampere. on a terminated
tube, shall
be flat within f 5 dB from 800 Hz to 15 kHz. On a 2350 horn, response Nominal
shall be ?3 dB from 500 Hz to 17 kHz.
impedance
shall be 16 ohms and power capacity
shall be at least 30 Watts normal
speech or music program
material. The compression
driver shall be JBL Model 2420
drivers will be considered submitted
for equivalency
data from a recognized
verify that the above performance
provided
Independent specifications
Other that
test laboratory are met
JBL Professional Products are not intended for household use.
Professional Division James B. LanSlng Sound, Inc
,850O Balboa Boulevard,
Northridge,
Callfornla 91329
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