JBL 4675C

Name: JBL 4675C
Brand: JBL

The JBL 4675C is a professional cinema loudspeaker, a compact high-output CinemaScope screen array system. It's a two-way, bi-amp design built to sit behind a perforated movie screen, and it was intended to handle the demands of large-format cinema sound. The system pairs two 12-inch 2206H woofers in a trapezoidal, vented enclosure of 18 mm multi-laminate birch with a 1-inch exit 2417H compression driver mounted on a PT (Progressive Transition) waveguide with 90° × 50° coverage. Crossover is at 1300 Hz, with 24 dB/octave slopes recommended.

The specs are built around headroom in a theater. Sensitivity is rated at 98 dB (1 W @ 1 m) for the LF section and 105 dB for the HF section. Maximum output reaches 123 dB average and 125 dB peak on the low end, and 113/115 dB average/peak on the high end. Recommended amplifier power is 400 W continuous for the LF and 100 W for the HF. Both sections are 8 ohms. The LF section connects via NL4 Speakon connectors, while the HF uses screw terminals.

The 4675C is a dual-bandwidth system, so it can be run with or without subwoofers. The LF section is configurable in either "Direct" or "Subwoofer-assisted" mode, and JBL specified the DSC280 digital controller to handle that configuration. Without the controller, you don't get the intended response. The whole cabinet measures 706 × 853 × 683 mm and weighs 47 kg (103 lb), finished in black textured coating.

Studio Sound (February 1995, p.67) covered this era of cinema sound in the context of film releases like Radioland Murders, noting the growing sophistication of sound editorial and mixing techniques, alongside the increasing use of THX-certified processing and screen array systems in professional theaters.

Production years, original price, and any user or installer feedback are not documented. The two sources that list the 4675C agree on every specification, which suggests they trace back to a common JBL datasheet. Beyond that sheet, the written record is thin.