2 3 6 0 A ,
Bi-Radial® Constant
2365A, 2366A Coverage Horns
Professional Series
Key Features:
Uniform on and off axis frequency response
Full horn loading to 350 Hz
Precise horizontal and vertical pattern control
Uncolored sound quality
49 mm (2 in.) throat entry
JBL Bi-Radial® horns¹ are designed to provide uniform on and off axis frequency response from below 500 Hz to beyond 16 kHz. The horn’s unique geometry and relatively tall vertical mouth dimension ensure precise vertical, as well as horizontal, beamwidth control throughout the rated frequency band. Since both horizontal and vertical coverage patterns remain essentially constant, horn performance may be easily predicted for any given frequency or orientation. Cluster design, therefore, is simplified and the need for horn overlapping is minimized. Typical cluster performance problems such as 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 patented horn design yields smooth reponse, low distortion, and even coverage. This design avoids the problems normally associated with 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.
Three horn models are available with nominal coverage angles of 90° x 40,° 60° x 40° and 40° x 20° ( - 6 dB, Horizontal x Vertical). All three feature 795 mm
(315/16 in) |
square mouth dimensions to further simplify cluster design. In addi- |
tion, the 90° x 40° and 60° x 40° horns are identical in length. |
|
Each |
Bi-Radial® constant coverage horn is supplied with a cast aluminum |
throat that will accept JBL 2446, 2450, or 2485 50 mm (2 in) throat diameter compression drivers. 25 mm (1 in) throat diameter drivers may be mounted if a proper horn throat adapter is installed. Mounting tabs are provided on all four sides of the supplied horn throat and are located just behind the combined horn/driver center of gravity.
To ensure freedom from resonances, light weight, and superior structural strength, the horn bell is constructed of heavy duty, 7.5 mm (5/16 in) thick, fiberglass reinforced plastic. Mounting holes are provided on the top wall of the bell to facilitate three-point hanging.
U.S. Patent No 4,308,932. Foreign patents pending
2360A, 2365A, 2366A Bi-Radial® Constant Coverage Horns
Model 2360A |
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Beamwidth vs Frequency |
Directivity vs Frequency |
Horizontal Off-axis Response |
(Normalized to on-axis) |
Vertical Off-axis Response |
Model 2360A Frontal Isobar Contours |
Dimensions |
are |
in |
millimeters. |
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Dimensions |
in ( |
) |
are in inches |
500 Hz octave bandwidth constant sound pressure contours of 0 to -12 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 5°
1 kHz octave bandwidth constant sound pressure contours, Same conditions as 500 Hz contours.
2 kHz octave bandwidth constant sound pressure contours. Same conditions as 500 Hz contours. This data may be considered essentially the same as would be observed at 4 kHz and 8 kHz, considering only the -3, -6, and -9 dB isobars.
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