JBL 4680B (circa 1984)
The JBL 4680B is a professional line-array speaker system from JBL's Cabaret series. It was made for sound reinforcement in small halls and banquet spaces. In Japan it was priced at ¥500,000 per unit around 1984. A dedicated front cover, the 4680CTR, was sold separately for ¥30,000.
It's a 2-way, 6-speaker bass-reflex design. Four 25 cm cone drivers (the E110) handle the low end. A pair of 2402H horn tweeters handles the highs. The crossover point is 3 kHz, and the frequency response is 55 Hz to 15 kHz (-10 dB). Sensitivity is rated at a healthy 105 dB/W/m. Continuous program input is rated at 300W, and impedance is 8 ohms. Dispersion is specified at 60° horizontal by 40° vertical.
The enclosure is 19 mm multi-layer plywood with a polyurethane coating over the entire surface. It has corner guards for stacking and handles for transport. A level control for the high-frequency band sits on the cabinet, and the input terminal is an M6 phone jack. It's a big box: 421 mm wide, 1,335 mm tall, 379 mm deep, and 62.1 kg.
Documentation on the 4680B is thin beyond these figures. No period reviews have surfaced, and production years aren't pinned down beyond the circa-1984 price listing. One auction record shows a unit selling for ¥125,001, though the date of that sale isn't confirmed.
- Type: 2-way, 6-speaker, bass-reflex line array
- Low band: 25 cm cone (E110) ×4
- High range: horn (2402H) ×2
- Frequency response: 55 Hz – 15 kHz (-10 dB)
- Allowable input: 300W continuous program
- Impedance: 8 Ω
- Sensitivity: 105 dB/W/m
- Crossover: 3 kHz
- Dimensions: 421 × 1,335 × 379 mm
- Weight: 62.1 kg
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