Jbl 2370 a brochure

Page 1

JBL

Flat-Front Bi-Radial® Horn

Professional Series

Key Features:
90° x 40° nominal dispersion

Uniform horizontal on and off axis
frequency response

Precise horizontal pattern control
Full horn loading to 630 Hz

Flat front, compact size, and light
weight construction

25 mm (1 in) throat entry

The jBL Model 2370A is a compact
BirRadialmhorn with a nominal cover
age pattern of 90° horizontal x 40°
vertical. The horn provides uniform
on and off axis frequency response
in the horizontal plane from 630 Hz
to beyond 16 kHz. The horn? small
vertical mouth dimension was chosen
to allow a gradual narrowing of
the vertical coverage pattern with
increasing frequency. This provides
acousnc equalization of the frequency
response of the horn in the horizontal
plane and compensates for the falling
power response of all compression
drivers. Should constant vertical pat
tern control be required, two or more
2370As may be stacked to restore full
BirRadial performance.

The horn: exceptionally consistent
horizontal dispersion eliminates the
midrange narrowing and high fre
quency beaming problems typically
associated with conventional horn
designs. Additionally, the 2370133
highly predictable performance
greatly simplifies cluster design.
The need for horn overlapping is
minimized and lobing and comb filter
effects are Wrtually eliminated.

~=-I-I-

Specifications:

cuveragc: Angle ( 76 dB) Frequency
Horizontal: 90° ( + 107°, 15°) (130 Hz , 16 kHz
Vertical: 112° 1 kHz
69° 2 kHz
42° 4 kHz
28° 8 kHz
21° 16 kHz
Directivity:

Directivitv Factor (Q):

12.2 (+101, . 5:2)

Directiviry Index (D1):

109 dB (+ 2.6: . 2.4)

Average Range:

1 kHz , 16 kHz

Usable Low Frequenc' Limit: 500 Hz
Minimum Recommended
Crossover Frequency: 630 Hz

Axial Pressure Sansillvifyt

11011BSPL.1W@1m

Construction:

Injection molded reinforced higndensiry solid polyurethane

Overall Dimensions:

Mouth Heigiir:

173 mm (6.81 in)

Mouth Width:

445 mm (17.5 in)

Length:

174 mm ((1.84 in)

Muuiuing Dimensions:

Rear Height:

175 mm (5.31 in)

Rear Width:

400 m (15.75 in)

Baffle Cutout Required (Front

mounting only)

Height:

158 film (544 in)

Width:

403 min (15.88 in)

Ner Weight:

1.4 kg (3 lb)

Shipping Weight:

2.3 kg (5 lb)

Measured an axis in die far tietd with 1 watt (233 \' ms. 8 ohms) inpur ind rer'ereneeii in i merer disranae using die
inverse square law Listed sound pressure represents an average {min 1 kHz to 4 kHz using the jBL Mndei 242m diner

JBL continually engages in research retried to prudurr improvement New marenits, production meiiimis, and design

refinements are inimdured inm existing

products without uuuee as a inurine expression of that nniinsnphs Fur diis

reasnn. any currenr JEL product may differ in some respect from us published description, but Witt alums equai or
exceed die original design sptuficauons uniess otherwise srired

Page 2

} 2570A Flat-Front Bi-Radial®Horn

Computer aided design techniques were used to derive
the horn contours in the horizontal and vertical planes.
Utilizing sidewall contours based on a polynomial power
series formula, the horn design yields smooth response,
low distortion, and even coverage. This design avoids the
performance disadvantages of horns that feature sharp
flare transitions and flat sidewalls. The BirRadial come
pound flare configuration of the horn provides constant
coverage over defined, solid angles.

The 2370A features an integral throat that will accept
any )BL compression driver having a 25 mm (1 in) throat
diameter. The flat front design of the horn allows flush
mounting on enclosure baffles. Mounting tabs are pro,
vided for enclosure or cluster mounting. To ensure free
dom from resonances, light weight, and superior strength,
the horn belt is constructed of molded structural foam.

Frequency Response and Impedance

120

110 1W
5 E
a 3
3 100 316 3
n 5
v 2
'l a.
g E

so 10

80 , 3J6

mo mo 1m moo

Frequency Hz

Frequency response of the 2370A, measured on axis at a distance of
1 meter with 1 wail (2.83 v RMS) applied in a JBL Model Z425H come
pression driver, in a reflecnonrfree environment, with impedance vs
frequency curve.

Beamwidth vs. Frequency
360
300

mZW
E130

a
p

Beamwirflh (-6 :18) Deg

n
o

9

10002095 59001000020000

56 mo 200 590
Frequency Hz

a

Directivity vs. Frequency

in m

immmimm

In 50 I06 M £06
Froquoncy N1

Horizontal Off-Axis Response

40

u
a

Relauve Laval In 43 SPI.
»
a

B

o
1 00 $300 woos 20000

Frequency Hz

Horizontal ()ffraxis response raken ai 15 deg-rec intervals out lo 60
degrees off axis.

Vertical Off-Axis Response

4o
an
20
in
o
106 i060 16000 200
Frequency Hz
Harmonic Distortion
IW um
um lav-l
12»
no mm
-"w E
i 3
fl 3
a 911 ms 5
5-; E
In E
n m
m- 13 I . i.
m «in: mm m

rmmey Rx

Second and third harmonic distortion curves of (he 2370A with 1 wart
(2.83 V RMS) and 10 watts (8.94 V RMS) applied to (he jBL Model
242511 compression driver. Measured on axis at a distance of 1 meier
in a reflectionrfree environment.