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JBL 4645C Subwoofer System
The JBL Model 4645C is a high quality subwoofer system, featuring an advanced technology 460 mm (18 in), low frequency transducer mounted ina 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.
Transducer:
The 2242H transducer utilizes the patented Vented Gap Cooling (VGC) process*, which pumps air through the magnetic gap and directly over and around the voice coil, providing immediate heat transfer and a
reduction in operating temperature. This increases power handling while reducing power compression.
The 2242H utilizes a rugged 100 mm (4 in) diameter voice coil and incorporates a large motor structure
with a pole piece that extends both above and below the top plate to improve gap flux symmetry and
increase thermal conductivity. This magnet structure and the use of a voice coil with one-third more
exposed area than in former designs, provides the 2242H with very effective heat sinking, enabling the system to carry an 800 watt continuous AES pink noise power rating.
Key Features:
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800 Watts Continuous Pink Noise, 1600 Watts Continuous Program Power Handling
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Usable response to 22 Hz (-10 dB, no EQ), flat to 22 Hz (-3 dB) with External EQ
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2242H SVG (Super Vented Gap) Cooled Driver
– High Sensitivity
– Minimal Power Compression
– Highest Maximum-SPL Capability
– Extremely Low 2nd and 3rd Harmonic Distortion
– Symmetrical Field Geometry (SFG) Magnet Structure
– Extended Excursion Capability
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Approved by Lucasfilm, Ltd. for THX® installations
Specifications:
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Low Frequency Driver: 2242H
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Frequency Range: 22 Hz - 500 Hz (-10 dB)
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Power Capacity (Continuous Pink Noise): 800 Watts
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Power Capacity (Continuous Program): 1600 Watts
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Sensitivity: 99 dB SPL (1W, 1m, 3.3ft.)
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Crossover Frequency: 80-150 Hz recommended
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Nominal Impedance: 8 Ohms
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Dimensions (HxWxD): 39.75" x 26.5" x 17.75" (1010 x 674 x 450 mm)
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Net Weight: 63 kg (138 lb)
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