JBL 4755A (c. 1990–1992)
The JBL 4755A is a big, serious loudspeaker from the company's Sound Power series. It's a high-power two-way system intended for sound reinforcement and full-scale music playback in medium-sized and larger halls. It was priced at ¥480,000 per unit around 1992, which tells you it was aimed at professional installs and demanding users rather than casual home listening.
The design is a 2-way, 3-speaker bass reflex system. The low end is handled by two 30 cm cone woofers (model 2206H), while the high frequencies come from a horn-type unit pairing a 2445J compression driver — with a 10 cm titanium diaphragm — with a 2380A flat-front biradial horn with a 5 cm throat. It's a bi-amplified drive system, with separate LF and HF inputs: the low section is rated at 4 ohms and takes up to 1,200W (AES, 50 Hz–500 Hz), while the high section is 16 ohms and rated at 150W continuous program. The recommended crossover point is 1.2 kHz. Sensitivity is substantial — 98 dB/2.83V/m on the LF side and 112 dB/2.83V/m on the HF side, with maximum outputs of 129 dB and 133 dB respectively. Frequency response is rated at 32 Hz to 20 kHz (-10 dB), with directivity of H90° x V40° (-6 dB). Input connections are via Neutrik NL8MPR connectors, and each cabinet weighs 60 kg with external dimensions of 850 x 680 x 480 mm (W x H x D).
The 4755A was part of JBL's Sound Power series. The company's own brochure positioned it alongside the 4745A, 4748A, 4785A, and 4788A VLF systems for extended low-frequency performance. The 4756A appears to be a related variant - one forum user described it as "a 4755A with the 2x2404H option." The brochure dates to 1990, and the price reference is "around 1992," so production likely fell in that window, though exact years aren't documented.
Owner reports are thin but positive. One forum user running four 4755As alongside four 4745As noted everything was original except a single blown compression diaphragm. Another owner in Vietnam described their pair as "rarely encountered" and nicknamed the unit "Tyrannosaurus Rex," which suits a 60 kg cabinet rated for 1,200 watts. A French forum poster mentioned recovering a pair from an old business and finding little documentation to go with them.
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