JBL 4866

The JBL 4866 is a professional cinema loudspeaker from JBL's "Cinema Products" lineup. It's a three-way, bass-reflex cabinet built for movie theater installations. It never got the consumer-press attention of the L-series home speakers, so the documented record is thinner than you'd expect for a speaker this big.

Here is what's known with reasonable confidence. The driver complement is a 2225H 15-inch woofer, a 2110H 10-inch midrange, and a 2402H slot tweeter mounted on the 2397 flat-front constant-directivity horn. Collectors often call that horn the "butt cheek," though strictly that nickname belongs to the earlier curved-front 2395. The crossover is the JBL LX300. Per the Speaker Database, the system is rated at 95 dB/w/m sensitivity, 8 ohms impedance, 40-18,000 Hz frequency response (±5 dB), and 150W continuous sine wave power handling. Those figures come from a single database source, so treat them as approximate.

Owner reports on Audiokarma are generally positive. The 2397 horn is described as smooth, and the 2225H gives it solid, clean low end. There are recurring complaints, though. The LX300 crossover caps drift and roll off the highs, foam surrounds on the 2110H rot, and the 2397's mounting bolts corrode and strip. Recapping the LX300 is widely cited as the single biggest upgrade. Parts like the 2110H and 2402H are no longer stocked by JBL and can be expensive on the used market.

The 4866 also shows up in period trade coverage. Recording Engineer (April 1986, p.52) documented its use in the rear-fill cluster of Neil Diamond's arena tour. That setup paired six 4866 long-throw boxes with 4873 and 4860 cabinets for 180-degree coverage. It was designed for cinema, and it clearly found its way into large-format live sound too.

Known Specs

Type: 3-way, bass-reflex professional cinema loudspeaker
Drivers: 2225H 15" woofer, 2110H 10" midrange, 2402H slot tweeter on 2397 horn
Crossover: LX300
Sensitivity: 95 dB/w/m
Impedance: 8 ohms
Frequency response: 40–18,000 Hz (±5 dB)
Power handling: 150W continuous sine wave

Production years, original pricing, and cabinet dimensions aren't documented in the available record. The 4866 sits alongside models like the 4670 and 4675 in JBL's cinema series. Some owners describe it as the "bigger brother" to the 4675, but the exact hierarchy within that lineup isn't clearly established.