JBL 4645C Single 460 mm (18 in.) Subwoofer System The JBL Model 4645C is a high quality subwoofer system, featuring an advanced technology 460 mm (18 in), low frequency transducer mounted in a direct radiator, bass-reflex enclosure for smooth response to the lowest audible frequencies. The 4645C is ideal for low-frequency augmentation of either analog or digital soundtracks in motion picture theaters and for general sound reinforcement applications. FEATURES ∧ 800 Watts Continuous Pink Noise, 1600 Watts Continuous Program Power Handling Usable response to 22 Hz (-10 dB, no EQ), flat to 22 Hz (-3 dB) with External EQ 2242H SVGTM Super Vented Gap Cooled Driver – High Sensitivity – Minimal Power Compression – Highest Maximum-SPL Capability – Extremely Low 2nd and 3rd – Harmonic Distortion – Symmetrical Field Geometry SFGTM – Magnet Structure – Extended Excursion Capability Approved by Lucasfilm, Ltd. for THX® installations SPECIFICATIONS ^ Rated Impedance 8 ohms Minimum Impedance 7.2 ohms Power Handling Capability - Continuous Pink Noise 800 watts Continuous Program 1600 watts Peak Power 3200 watts Output Capability - Axial Sensitivity 50 Hz to 500 Hz; 99 dB, 1W @ 1m 40 Hz to 100 Hz; 97 dB, 1W @ 1m Power Compression - At -10 dB power (80 W) 0.6 dB At -3 dB power (400 W) 2.0 dB At rated power (800 W) 3.3 dB