JBL 4645A
The JBL 4645A is a cinema subwoofer, and the record on it is thin. What survives comes mostly from occasional mentions in home-theater system listings and forum posts by owners. No formal spec sheet, no production dates, and no original pricing have turned up in the available research. The one hard fact that appears consistently: it's an 18-inch subwoofer.
A French home-cinema installation listed a pair of them as "2 SUB Cinéma JBL 4645A," paired with five JBL LX1000 MKII fronts and four JBL 8330A surrounds. A long-time owner on the Audio Heritage forum reported using a JBL 4645 (the model without the suffix) in a home cinema for nine years. He said it ran the LFE channel "flawlessly" and measured in-room LFE-only SPL up to 105 dBc. The same owner noted that when he balanced two low-end center-channel signals and sent them to both an Eltax A-12R 12" and the JBL 4645 18", the impact climbed to 108 dBc. A Craigslist listing for a 4645A/4645B describes it simply as an "18 inches JBL subwoofer," and the seller noted they had four available and would audition them at pickup.
Known specs:
- 18-inch subwoofer driver
- Intended for cinema / LFE applications
- Variant "4645B" also exists (no details documented)
Beyond that, almost nothing is formally recorded. There is no frequency response, power handling, dimensions, or weight. It appears to have been a workhorse cinema sub that found its way into enthusiast home theaters.
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