JBL 2340 Constant-Directivity Horn

The JBL 2340 is a professional-series constant-directivity horn, built to mate with JBL's 1-inch compression drivers. It was sold in Japan at ¥28,000, though no specific year for that price is documented. Dispersion is 90° horizontal by 40° vertical. Crossover frequency is 800 Hz and sensitivity is 105 dB/W/m. It covers 500 Hz to 16 kHz at 8 ohms nominal impedance. It weighs 5.4 kg and measures 330 mm wide, 300 mm high and 236 mm deep.

The interesting part of the 2340 is which drivers fit it. JBL's own archive lists the 2420, 2421, 2425, 2426, 2440 and 2441. That covers both the older alnico-magnet units and the later ferrite types. Some sources also include the titanium-diaphragm 2425B and 2426B. The constant-directivity design was JBL's move toward uniform coverage and a flatter power response. The older radial horns colored the sound off-axis.

Studio Sound (May 1977, p.77) ran an advertisement from a London professional audio dealer that listed JBL professional equipment among its offerings — a small period glimpse of how these horns circulated in the pro market.

Production dates for the 2340 itself aren't recorded. The closely related 2340A is noted as having been made from 1982 to 1984, which may bracket the 2340's era, but that's an inference, not a documented fact. The archives are also muddled. The Hifi-wiki page for the 2340 shows an image of a 2340A and labels its spec table as such, so don't conflate the two. What is solid: the 2340 is a constant-directivity horn, 90° x 40°, crossed at 800 Hz, priced at ¥28,000 in Japan.

• Type: Constant-directivity horn, Professional Series
• Dispersion: 90° H x 40° V
• Frequency range: 500 Hz – 16 kHz
• Crossover frequency: 800 Hz
• Sensitivity: 105 dB/W/m
• Impedance: 8 ohms
• Applicable drivers: 2420, 2421, 2425, 2426, 2440, 2441 (2425B/2426B per some sources)
• Dimensions: 330 x 300 x 236 mm (W x H x D)
• Weight: 5.4 kg
• Original price: ¥28,000 (Japan)

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JBL 2340 horn 2461 16Ω 1 inch throat driver set famous rare

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