JBL 2366 (Years Unknown)

The JBL 2366 is a professional Bi-Radial constant directivity horn, part of JBL's large-format cinema and touring sound lineup. The JBL Sound System Design Reference Manual lists it as the "2366A" and gives the operating range as 500 Hz to 21 kHz (±3 dB). It was designed to work with a crossover set at 500 Hz or below, and the manual states it replaces the earlier JBL 2365 in such configurations. A stadium sound system at the University of Illinois used JBL 2360 horns on a delayed circuit to cover the grandstand (Sound and Communication, December 1983, p.22).

The horn takes either a 2425B or 2445J compression driver. The 2445J is rated at 150 watts. Connection is through two 1/4-inch jacks wired in parallel, with pin 2 positive. Positive voltage at the terminal pushes the cone outward. That is everything the manufacturer documents, and the record gets thin after it.

Field reports come from a ProSoundNetwork forum thread. Installers found the 2366 had excellent pattern control. Opinions on voicing split: one user called it harsh next to a 2360A, while another found it smooth with the right driver. The throat is awkward to align, the horn is heavy (no figure given), and the mounting screws strip easily. The original JBL diaphragms are discontinued, so aftermarket replacements are the only option now.

No available source documents a production run, original price, weight, or sensitivity figure. The relationship between the "2366" and "2366A" designations is also unresolved. Forum participants disagree on whether the "A" marked a revision, a change in mounting hardware, or a different throat size, and the manual doesn't clarify. Anyone with one should expect a heavy-duty professional horn that needs careful setup and a proper 500 Hz crossover.