JBL 2386 Brochure

2386

Flat-Front
Bi-Radial Horn

Key Features:

䉴

40° x 20° nominal dispersion

䉴

Uniform horizontal on- and off-axis
frequency response

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Precise horizontal and vertical
pattern control

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Full horn loading to 400 Hz

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Flat front, compact size

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Lightweight construction

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49 mm (2 in) throat entry

The JBL 2386 Flat-Front Bi-Radial

TM

horn1is designed for flush cabinet
mounting or compact cluster applica­tions. The 2386 has a nominal cover-

age pattern of 40° horizontal by 20°

vertical. It provides uniform on-and
off-axis frequency response from
1 kHz to beyond 16 kHz in the hori­zontal plane and 2.5 kHz to 16 kHz
in the vertical plane, with constant
directivity above 2 kHz. The horn’s
small vertical mount dimension (just
slightly larger than the compression
driver used to drive the horn) allows
very compact single and multiple
horn/driver systems to be put togeth­er. Should vertical pattern control be
required below 2.5 kHz, two or more
horns may be stacked vertically to
restore full Bi-Radial performance.

The exceptionally consistent hori­zontal dispersion eliminates the
midrange narrowing and high fre­quency beaming problems typically
associated with conventional horn
designs. Additionally, the highly pre­dictable performance of the 2386
greatly simplifies cluster design. The
need for horn overlapping is mini­mized and lobing and comb filter
effects are virtually eliminated.

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-RadialTMcom­pound flare configuration provides constant coverage over defined, solid
angles. To ensure lightweight, superior strength, and freedom from reso­nances, the horn bell is contructed of injection-molded, reinforced, solid
polyurethane.

The 2386 will accept the 49 mm (2 in) diameter throat 2441, 2445, or
2482 compression driver. With the addition of the 2327 adapter, the horn
will also accept the 25 mm (1 in) throat 2425 driver.

1

U.S. Patent No. 4,308,932. Foreign patents pending

Professional Series

䉴 2386 Flat-Front Bi-Radial Horn

Specifications:

Nominal Coverage: 40° Horizontal x 20° Vertical

Throw: Long

Horizontal Coverage:

Angle Degrees (–6 dB): 45 (+12 –14)

Average Range: 1 kHz-16 kHz

Vertical Coverage:

Angle Degrees (–6 dB): 25 (+11 –10)

Average Range: 2.5 kHz-16 kHz
Directivity Factor (Q): 44.9 (+38.2 –18.1)
Directivity Index (Di): 16.5 dB (+2.7 –2.2)

Average Range: 2 kHz-16 kHz

Throat Diameter: 49 mm (2 in)

Usable Low Frequency Limit: 350 Hz

Minimum Recommended

Crossover Frequency: 400 Hz

Axial Pressure Sensitivity: 116 dB SPL, 1W @ 1 m

Construction: Injection-molded reinforced

high-density solid polyurethane
[nominal 10 mm (0.38 in) wall
thickness]

Color: Black

Overall Dimensions:

Mouth Height: 279 mm (11 in)

Mouth Width: 445 mm (17.5 in)

Length: 359 mm (14-⁹⁄₆₄ in)

Mounting Dimensions:

Rear Height: 235 mm (9¼ in)

Rear Width: 400 mm (15⅞ in)

Baffle Cutout Required: (Front mounting only)

Height: 238 mm (9⅜ in)

Width: 403 mm (15⅞ in)

Net Weight: 5.5 kg (12 lb)

Shipping Weight: 7.3 kg (16 lb)

1

Measured on axis in the far field with 1 watt (4.0 VRMS, 16 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 2441, 2445 or 2482 driver.

Beamwidth vs Frequency

Directivity vs Frequency

300

200
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100

90
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60
50
40

30

20

Beamwidth (-6 dB) Degrees

10

왕
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왕

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2001005020

Frequency in Hz

100

Q

10

1

20 50 100 500

쑗

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Frequency in Hz

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Vert.

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Hor.

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20

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10

0

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2000010000500020001000500

D

I

dB

Frontal Isobar Contours

1 kHz octave bandwidth constant sound pressure
contours. Same conditions as 500 Hz contours.

4 kHz octave bandwidth constant sound pressure
contours. Same conditions as 500 Hz contours.

500 Hz octave bandwidth constant sound pressure
contours of 0 to –18 dB in steps of –3 dB. The con­tours are plotted on polar grid lines with on axis
being the center of the plot. The data was gathered
by taking an octave polar plot at all oblique angles

from 0° (horizontal) to 90° (vertical) in steps of 15°.

Same test conditions as horizontal polar response.

2 kHz octave bandwidth constant sound pressure
contours. Same conditions as 500 Hz contours.

8 kHz octave bandwidth constant sound pressure
contours. Same conditions as 500 Hz contours.

Vertical

90°

60°

–9 dB

–6 dB

-3 dB

20° 40° 60° 80° 100° 120°

0°

0 dB on Axis

Vertical

90°

-15 dB

-12 dB

-9 dB

-6 dB

-3 dB

20° 40° 60° 80° 100° 120°

0°

0 dB on Axis

-18 dB

–12 dB

30°

0°

Horizontal

Vertical

60°

30°

0°

Horizontal

90°

-18 dB

-15 dB

-12 dB

-9 dB

-6 dB

-3 dB

20° 40° 60° 80° 100° 120°

0°

0 dB on Axis

60°

30°

0°

Horizontal

Vertical

90°

-18 dB

-15 dB

-12 dB

-9 dB

-6 dB

-3 dB

0°

0 dB on Axis

60°

30°

20° 40° 60° 80° 100° 120°

0°

Horizontal

Vertical

90°

-18 dB

-15 dB

-12 dB

-9 dB

-6 dB

-3 dB

0°

0 dB on Axis

60°

30°

20° 40° 60° 80° 100° 120°

0°

Horizontal

JBL Professional
8500 Balboa Boulevard, P.O. Box 2200
Northridge, California 91329 U.S.A.

A Harman International Company

SS 2386
CRP 5M
12/97

䉴 2386 Flat-Front Bi-Radial Horn

Frequency response and
impedance. Frequency response

of the 2386, measured on axis
at a distance of 1 meter with
1 watt (4.0 V RMS) applied to
JBL Model 2445 compression
driver, in a reflection-free
environment, with impedance
vs. frequency curve.

Harmonic distortion. Second
and third harmonic distortion
curves of the 2386 with 1 watt
(4.0 V RMS) and 10 watts
(12.65 V RMS) applied to the
JBL Model 2445 compression
driver. Measured on axis at a
distance of 1 meter in a
reflection-free environment.

Horizontal off-axis response. Horizontal off-axis response taken at 10 degree intervals out to 60° off axis. Both nor­malized (equalized flat on-axis) and unequalized responses are shown.

Vertical off-axis response. Vertical off-axis response taken at 10° intervals out to 60° off axis. Both normalized (equal­ized flat on-axis) and unequalized responses are shown.

120

110

100

SPL dB (re 20␮ Pa)

90

80

10W level

1 W level

SPL dB (re 20m Pa)

120

110

100

130

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110

100

90

90

80

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60

10dB

1000100

Frequency in Hz

10 dB

1 W 3rd H.D.

100 1000

Frequency in Hz

31.6

10

3.16

2000010000

Impedance Ohms

100%

10 W 2nd H.D.

1 W 2nd H.D.

10%

10W 3rd H.D.

1%

10000 20000

NO
EQ

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60°

Distortion in % (Approx.)

EQ

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No EQ

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