Cinema Sound 3000 : 4000 : 5000 : ScreenArray Systems (2 way) : ScreenArray Systems (3 way) : Subwoofers 4000 Series : Surround Systems   No other manufacturer provides a wider, more cost-effective range of solutions to take on the demands of modern cinema sound reproduction than JBL Professional. With one of the longest track records in the industry (James B. Lansing Sound, Incorporated manufactured some of the world's first true high-fidelity loudspeakers for cinema sound systems) and JBL's legendary reputation for quality, reliability, and innovation, its easy to see why today more than three quarters of all cinema loudspeakers sold worldwide come from JBL Professional. Transducer Rated Impedance Minimum Impedance 4641 4641 Single 460 mm (18 in.) Subwoofer System JBL Model 2241H 460 mm (18 in) Low Frequency Transducer 8 ohms 6.3 ohms Rated Impedance Minimum Impedance Power Handling Capability 4642A 4642A Dual 460 mm (18 in.) Subwoofer System 4 ohms 3.2 ohms - Rated Impedance Minimum Impedance Power Handling Capability 4645C 4645C Single 460 mm (18 in.) Subwoofer System 8 ohms 7.2 ohms -