The Model 2231H low frequency accurate,
solid low-frequency
free air resonance has exceptronal enclosure
deep bass response
volume
exceptronal
Compared
constructed efficiency
with
and requires very ltttle
to other loudspeakers
having
response
linear,
of mechanical
enclosure,
and transient
ability to handle sustained L-
Designed
The 2231H has a low-loss
is unusually
only f 2 dB from 40 Hz to 800 Hz When housed
in a properly
danger
reproductron
provides
below the range of hearing, the 2231H
similar sensitivity, its frequency varying
loudspeaker
the 2231H will exhibit response
as well as the
signals at high power levels without
damage
or excessive
drstortron
magnetic
8.5 kg (18% lb) and incorporates Field Geometry aluminum
that weighs
JBL’s unique Symmetrical
(SFG). This design, in combination
Flux Stabilizing
reduces second harmonic The combination
Ring around distortion
of this powerful
rugged
cone assembly
wound
copper
with the
the pole piece,
to inconsequential
magnetic
structure,
and 100 mm (4 In) diameter
levels a edge-
nbbon voice coil enable the 2231H to achieve
200 W continuous sensitivity
structure
program
and smooth
power capacity, exceptronal
acoustrc output
Architectural
Specifications
The low frequency
transducer
shall have a nominal
of 380 mm 115 InI, overall depth not greater
diameter
than 145 mm
(5% In), and weigh at least 10 1 kg (22 lb). The frame shall be of cast aluminum assembly
to resrst deformation,
and the magnetic
shall utilize a fernte magnet and produce
symmetrical
magnetic
an alumrnum
ring encirclrng
reduce flux modulatron in diameter operating
the pole piece shall act to
The vorce coil shall be 100 mm (4 In)
and shall be made of edgewound in a magnetic
Performance
a
field at the voice coil gap. In additron,
copper
nbbon
field of not less than 1 2 T
specifications
be as f.ol,lows: Measured
of a typical production
unit shall
sensitivity (SPL, 1 W at 1 m, averaged
from 190 Hz to 500 Hz) shall be at least 94 dB SPL on axis. As an indication
of electromechanical
conversion
efficiency,
the BI factor shall be at least 22 Tom. Usable frequency
response
On-axis response,
measured
shall extend from 25 Hz to 2 kHz. at a distance
more under free field conditions, to 800 Hz. Nominal capacity
impedance
shall be 8 R. Rated power
shall be at least 200 W typical program
The transducer speakers
for equivalency
data from a recognized
continually
ing products reason,
engages
productIon without
any current
descrlptlon spectflcatlons
I” research
methods
notice as a routlne JBL
but IS always unless
q:
product
expreswr
may differ in some
warranted
otherwise
refinements
that
test labora-
specifications
related to product
and design
provided
independent
tory verify that the above performance
materials,
material.
shall be the JBL Model 2231H. Other loud-
will be considered
submitted
JBL
of 2 m (6.6 ft) or
shall be *2 dB from 40 Hz
are met.
Improvement.
New
are Introduced
Into wst-
of that philosophy. respect
from
to equal or exceed the ortglnal
For this
its publlshed design
stated
Professional Division
James B. Lansing Sound, Inc., 8500 Balboa Boulevard,
Northridge,
California
91329 U.S.A.
ss2231 H/2 80 hnted
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