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.
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| Frequency Range (±3 dB) | 22 Hz - 100 Hz |
| Frequency Range (-10dB) | 20 Hz - 500 Hz |
| 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 |
| Net Weight (each) | 138 lbs (63 kg) |
| Dimensions (H x W x D) | 1010 mm x 674 mm x 450 mm 39¾ in x 26½ in x 17¾ in |
| Power Handling (2Hr AES Rating) | 800 W |
| Sensitivity | 97 dB |
| Maximum SPL (1m) | 128 dB |
| Nominal Impedance | 8Ω |
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