JBL 2365 Bi-Radial Horn
The JBL 2365 (also seen as the 2365A) is a Bi-Radial® constant-directivity horn from JBL Professional, designed for fixed installation and professional sound reinforcement work. It was announced alongside the larger 2360 and the 3266 as part of a new line of constant-coverage horns — Recording Engineer (June 1980, p.119) noted the new units were pitched as ideal for fixed installation applications, with the horn bells built from heavy-duty fiberglass reinforced plastic.
The horn is built around JBL's proprietary Bi-Radial geometry, which is designed to provide consistent coverage across its passband. Per the JBL Pro Service Manual, the 2365A has a nominal coverage angle of 100 degrees horizontal by 60 degrees vertical, and a usable frequency range of 500 Hz to 16 kHz. Acoustic loading is said to be optimum when the horn is cut off at 500 Hz.
It's meant to be paired with 1-inch exit (25 mm) high-frequency compression drivers; when used with the JBL 2425H or a similar driver, the specified 100° x 60° coverage holds. The horn itself is a component rather than a complete speaker system — there's no crossover, impedance, or power rating that applies to the horn alone.
Known Specifications
- Type: Bi-Radial constant-directivity horn
- Coverage: 100° horizontal x 60° vertical
- Usable frequency range: 500 Hz – 16 kHz
- Driver compatibility: 1-inch exit (25 mm) compression drivers (e.g., JBL 2425H)
- Horn dimensions: 9.0" L x 5.1" W x 3.8" D
- Flange dimensions: 17.0" W x 13.5" H
- Weight: 8.5 lb (3.9 kg)
Little else is documented about the 2365. No production years, original pricing, or market context have surfaced in the available record, and the relationship between the "2365" and "2365A" designations isn't explicitly clarified in any source. It clearly belongs to JBL's professional line of the late 1970s and 1980s — a period when constant-directivity horn design was a major focus across the industry — but beyond that, the paper trail is thin. What survives is the service manual data and the brief trade-press notice, which together confirm a competent, workmanlike pro-audio component built for a specific job.
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