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.

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