JBL 2370-A Brochure

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 light­weight construction

25 mm (1 in) throat entry

2370A

Flat-Front Bi-Radial® Horn

The JBL Model 2370A is a compact

Bi-Radial

®

horn with a nominal cover­age 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s small

vertical mouth dimension was chosen
to allow a gradual narrowing of
the vertical coverage pattern with
increasing frequency. This provides
acoustic 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 pat­tern control be required, two or more

2370As may be stacked to restore full

Bi-Radial performance.

The horns exceptionally consistent
horizontal dispersion eliminates the
midrange narrowing and high fre­quency beaming problems typically
associated with conventional horn
designs. Additionally, the 2370As
highly predictable performance
greatly simplifies cluster design.
The need for horn overlapping is
minimized and lobing and comb filter
effects are virtually eliminated.

Specifications:

Coverage: Angle ( -6 dB)

Horizontal: 90° ( + 10,°- 15°)

Vertical: 112°

Directivity:

Directivity Factor (Q): 12.2 (+l 0.l, - 5.2)

Directivity Index (DI): 10.9 dB (+ 2.6. - 2.4)

Average Range: 1 kHz - 16 kHz

Usable Low Frequency Limit: 500 Hz

Minimum Recommended

Crossover Frequency: 630 Hz

Axial Pressure Sensitivity¹:

Construction: Injection molded reinforced high-density solid polyurethane

Overall Dimensions:

Mouth Height: 173 mm (6.81 in)

Mouth Width: 445 mm (17.5 in)

Length: 174 mm (6.84 in)

Mounting Dimensions:

Rear Height: 175 mm (5.31 in)

Rear Width: 400 mm (15.75 in)

Baffle Cutout Required (Front mounting only)

Height: 138 mm (5.44 in)

Width: 403 mm (15.88 in)

Net Weight: 1.4 kg (3 lb)

Shipping Weight: 2.3 kg (5 lb)

¹Measured on axis in the far field with 1 watt (2.83 V RMS, 8 ohms) input and referenced to 1 meter distance using the

inverse square law. Listed sound pressure represents an average from 1 kHz to 4 kHz using the JBL Model 2425H driver.

JBL continually engages in research related to product improvement New materials, production methods, and design

refinements are introduced into existing products without notice as a routine expression of that philosophy. For this
reason, any current JBL product may differ in some respect from its published description, but will always equal or
exceed the original design specifications unless otherwise stated

69°
42°
28°
21°

110 dB SPL. 1 W @ 1 m

Frequency
630 Hz - 16 kHz

1 kHz
2 kHz
4 kHz
8 kHz

16 kHz

2370A 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 Bi-Radial com­pound flare configuration of the horn provides constant
coverage over defined, solid angles.

The 2370A features an integral throat that will accept
any JBL 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 pro­vided for enclosure or cluster mounting. To ensure free­dom from resonances, light weight, and superior strength,
the horn belt is constructed of molded structural foam.

Frequency Response and Impedance

Horizontal Off-Axis Response

Horizontal off-axis response taken at 15 degree intervals out to 60
degrees off axis.

Vertical Off-Axis Response

Frequency response of the 2370A, measured on axis at a distance of
1 meter with 1 watt (2.83 V RMS) applied to a JBL Model 2425H com­pression driver, in a reflection-free environment, with impedance vs
frequency curve.

Beamwidth vs. Frequency

Directivity vs. Frequency

Harmonic Distortion

Second and third harmonic distortion curves of the 2370A with 1 watt
(2.83 V RMS) and 10 watts (8.94 V RMS) applied to the JBL Model
2425H compression driver. Measured on axis at a distance of 1 meter
in a reflection-free environment.