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