JBL 2309
Little is documented about the JBL 2309. The record shows a constant-directivity horn from JBL's professional 2300 series. The few enthusiasts who have written about it take care to separate it from its more famous sibling, the 2307.
The 2309 is a conical-flare horn with 120° coverage, made for high-frequency reproduction. The most specific first-hand account comes from a user on the Lansing Heritage forum. He reported on a theater installation with a pair of 2309s on top of 2350 horns, fitted with 2-inch drivers. His verdict on their range: good down to 8,000 Hz - which implies they are no good for lower-mid or even mid-high work. As one forum user put it, "The 2309 does not do the lower mids like the 2307." That contrast is the clearest defining trait in the record. The 2307 is a 90-degree exponential horn good down to 1,000 Hz. The 2309 is a 120° conical horn with a much higher usable cutoff.
Beyond that, almost nothing is recorded. There are no production years, no original price, no dimensions or weight, no impedance or power handling ratings, and no driver model number beyond "2-inch." No official spec sheet or manual has surfaced. The 2309's constant-directivity design was discussed positively in the context of its coverage behavior, but no detailed qualitative sound assessments were found. Period trade coverage of JBL professional systems in this era focused on system design and equalization rather than individual horn components (DB Magazine, August 1982, p.40). In one such system description, a theater's line-level signals were routed through a pair of White one-third octave equalizers where stereo house equalization occurred (DB Magazine, August 1982, p.40).
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