Transcript
Model 2441 IS a powerful,
professional-quality
driver built to typrcal JBL standards 100 mm (4 in) voice werghlng
coil
compressron
of precision
and an AlnlcoV
A new suspension
Featuring
magnetic
a
structure
more than 10 kg (23 lb), It can take the most explo-
save transients
In stride and reproduce
dimensional bending
depth of the diamond
suspension
to eliminate by industry pneumatically
exponential
phase cancellations.
cast and machined
generated
The diaphragm
cause fatigue. After manufacture,
assembly
considered
is
impractical
of aluminum
drawn to shape to minimize
alloy is
crystal stresses that
the frequency
each driver is tested, and any deviation for rejection.
pattern
IS
response
in response
of
is cause
one oc&ve
support
beyond
response
of a threeto reduce
structure
closely controlled
The
to provrde
2nd and 3rd normal resonance resonance
design and precise manufacturing
the 2441 a frequency
horns, configured
The magnetic
to hold tolerances
standards.
design,
For), consisting
pattern, has been designed
modes and for the basic suspension
plug, a mathematically
consists of die cast concentric
diamond
stresses In the diaphragm
predrctablefrequenciesforthe
them at thunderous
levels with flawless accuracy The phasing
(Patent Applied
extending
that of Its predecessor
This control
approximately
give
Model 2441-Compression The compresslon encased
driver shall consist of an Alnlco V magnet
In a cast iron return circuit
parts shall be machined The phasing mlnlmlze
All magnetic
from cast or extruded
plug shall be assembled
phase cancellations,
to a tapered
Driver
assembly
billet stock
of concentric
The back cover shall be cast aluminum ribs to prevent
ringing
resonances.
drawn to shape through
sion structure
High frequency
; Sensitivity
alloy pneu-
response
the use of a three-dImensional
shall be suspen-
The voice co11shall be edgewound
aluminum
nbbon of not less than 100 mm (4 in) in diameter,
operating
in a magnetic
field of not less than 1 8 tesla (18,000 gauss)
Performance
speciflcatlons
of a typical production
Nominal Efficiency
Measured
sensitivity
Recommended Crossover
terminated
tube, averaged
1 m distance
sensitivity
of electromechanical
Frequency
response,
measured
on a terminated
to 12 kHz. Nomlnal capacity program
Impedance
shall be 16 ohms and power speech or music
material
The compression
178 mnn (7 in) diameter 138 mm (53/aIn) depth
Net Weight
11 3kg 11.8 kg
24% lb 26 lb
1. Continuous Drooram oower is deftned as 3 df3 areatt ?rthan conttnuous s,“e wave oower and IS a conservat~e expressfon of the transduceis ablilty to handle normal speech and mwc program material 2 Sensttivity measured wtth a 1 W input at 1 m distance on-ax?s from the mouth of a JBL 2350 90° r&al horn (nomtnal Q=6 3) wth an input signal swept from 500 Hz to 2 5 kHt 3 As speclfled by recogrwed standards organlratlons sensttlwty IS measured wth the driver coupled to a terminated tube The JBL sensltlvlty rattng represents the SPL m a 25 mm (1 1x11termmated tube usmg a 1 mW input stgnal(0 126 V into 16 0) swept from 500 Hz to 2 5 kHz The sensltwty rating wth a W Input would be 30 dB greater
shall be 23 dB from 500 Hz
shall be at least 70 watts normal
8,000 gauss)
Dimensions
; Shipping Weight
tube, shall be flat within *5 dB from 500 Hz to 8 kHz On a JBL Model 2350 horn, response
18T(l
con-
version efficiency, the BI factor shall be at least 17 newtons per ampere.
;
Pos&ve voltage to black terminal gives diaphragm motion toward the phasing plug
with a 1 W input at
from 500 Hz to 2 5 kHz, shall be at
least 111 dB SPL As an indication
!
51 Factor
on-axis from the mouth of a JBL model 2350
90’ radial horn, averaged
: :
Edgewcxnd aluminum ribbon
Voice Co11Matenal Flux Density
from 500 Hz to 2 5 kHz, shall be
at least 118 dB SPL Measured
:
0.08 mm (0.003 in) aluminum alloy 100 mm 4 in
Voice Coil Diameter
with a 1 mW input on a 25 mm (1 In)
i
500 Hz to 18 kHz 500 Hz or higher
: Diaphragm
be as follows:
It-l
25% (500 Hz to 2.5 kHz)
: Frequency Range
unit shall
2
7owcc 3ntinuous program at 500 Hz, 12 dB/octave slope 150 W continuous program at 1 kHz or higher, 18 dB/octave slope llldBSPL,lW@lmonJBL 2350 horn2 118 dB SPL, 1 mW on plane wave tube3
with
The dia-
shall be 0 08 mm (0 003 In) aluminum
controlled
Power Capacity’
throat, the mouth of which shall be 49 mm (2 in)
reinforcing matically
49 mm 16 n
and it shall be further coupled
In diameter phragm
horns to
Horn Throat Diameter
’Nomlnal Impedance
’
1
driver shall be JBL Model 2441. Other
drivers will be considered
for equivalency
mitted data from a recognized
independent
verify that the above performance
provided
that sub-
test laboratory
specifications
are met
:
Frequency response contour of Model 2441 coupled to a 2350 horn Measured response of a typlcal productlon unit, lncludlng all j peaks and dips, does not deviate more than 2 dB from the above curve.
IBLc~nfmually engages m research related to product m~provement New materials,, productmn methods. and design refmements are mtroduced mto exwng products wthout nowe as a IOUtme expressmn of that philosophy For this reason, any current IBL product may differ in some respect from Its pubhshed descnptlon, but wll always equal or exceed the orlgmal design specsflcatlons unless otherwse stated
JBL Professional, 8500 Balboa Boulevard, P.O. Box 2200, Northridge, California 9 1329 U.S.A.
882441
15M 3186 P841
~r,nted ,n u s A
