JBL 4560BKA
Documentation on the "4560BKA" designation is thin. The 4560BKA appears in JBL's Theatre Systems section of the Lansing Heritage database, but no dedicated spec sheet or literature for that exact suffix has surfaced. No source explains the "BKA" code. It may be a cabinet or finish variant of the 4560B, but that is conjecture. A 1983 clearance listing in Mix (March 1983, p.49) shows JBL loudspeakers among equipment sold at discounted prices.
The broader 4560 family is well documented. The JBL 4560 was a commercial cinema/theatre speaker system - a large-format, bass-reflex enclosure designed to fill theaters with high-SPL sound. It was not a home hi-fi speaker. In its configured 4-way form (the "4560B Theatre System"), the documented driver complement was a 2402 slot tweeter, a 2420 compression driver on a horn for midrange, and an LE15A 15" woofer. An LX5 crossover network split the bands at 500 Hz, 1.2 kHz, and 7 kHz. The spec sheet transcription for the 4560B system lists frequency response as 35-18,000 cycles (Hz). Those figures apply to the complete configured system, not necessarily to an empty 4560BKA cabinet.
Collectors on audioheritage.org describe the 4560 family as big, punchy and dynamic, with the forward, "live" presentation typical of JBL's horn-loaded pro cinema speakers. Owners report a few common restoration jobs: recapping the aged LX5 crossover capacitors, replacing the deteriorated foam surrounds on LE15A woofers, and replacing original 2420 diaphragms. Enthusiasts today often repurpose 4560 cabinets for home use with various driver substitutions.
No production years, original price, dimensions, weight, impedance, or power handling figures have been found for the 4560BKA specifically. No source explicitly states how "4560BKA" relates to "4560B".
- Type: 4-way theatre speaker system (bass-reflex cabinet)
- Documented driver complement (4560B system): 2402 slot tweeter, 2420 horn driver, LE15A 15" woofer
- Crossover: LX5 network — 500 Hz / 1.2 kHz / 7 kHz
- Frequency response (4560B system): 35–18,000 Hz
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