JBL 2391
Released in 1971
¥ 28,600 (1 unit, around 1973)
Commentary
A slant-plate acoustic lens designed for 2 - to 3-way systems where the listening position does not exceed 9m.
Each plate is calculated to be hyperbolic and is spaced at equal intervals to enhance the diffraction effect of the lens.
The 2391 is intended to be used at frequencies above 800 Hz, but it is more effective when used at frequencies above 1.2 kHz.
Model Rating
| Type | Horn lens |
| Directional (Horizontal x Vertical) | 80 ゜ x45 ゜ |
| Crossover frequency | 800Hz |
| Throat diameter | 2.5cm |
| Baffle plate mounting dimensions | 10.8cm |
| External dimensions | Horn : Diameter 156x Depth 216 mm Lens : Width 254x Height 156x Depth 63 mm |
| Weight | 1.1kg |
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