4645C Single 460 mm (18 in) Subwoofer System
Professional Series
Key Features:
c800 Watts Continuous Pink Noise,
1600 Watts Continuous Program Power Handling
cUsable response to 22 Hz (-10 dB, no EQ), flat to 22 Hz (-3 dB) with External EQ
c2242H 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
cApproved by Lucasfilm, Ltd. for THX® installations
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.
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.
*U.S. Patent #5,042,072. Foreign Patents Pending.
Specifications:
TRANSDUCER: JBL Model 2242H 460 mm (18 in) Low Frequency
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Transducer |
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SYSTEM: |
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Rated Impedance: |
8 ohms |
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Minimum Impedance: |
7.2 ohms |
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POWER HANDLING CAPABILITY: |
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Continuous Pink Noise1: |
800 watts |
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Continuous Program2: |
1600 watts |
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Peak Power3: |
3200 watts |
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OUTPUT CAPABILITY: |
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Axial Sensitivity4: |
50 Hz to 500 Hz; 99 dB, 1W @ 1m |
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40 Hz to 100 Hz; 97 dB, 1W @ 1m |
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Power Compression5: |
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At -10 dB power (80 W): |
0.6 dB |
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At -3 dB power (400 W): |
2.0 dB |
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At rated power (800 W): |
3.3 dB |
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Single |
Two |
Four |
Eight |
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Module |
Modules |
Modules |
Modules |
Half-Space Reference Efficiency6: |
4% |
8% |
12% |
16% |
Max. Continuous Acoustical |
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Power Output: |
32 W |
128 W |
384 W |
1024 W |
Maximum Continuous SPL @ 1 meter7: |
126 dB |
132 dB |
137 dB |
141 dB |
Maximum Peak SPL @ 1 meter7: |
132 dB |
138 dB |
143 dB |
147 dB |
FREQUENCY RESPONSE8: Lower Frequency Limits (no EQ): |
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-10 dB: |
22 Hz |
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-3 dB: |
35 Hz |
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Lower Frequency Limits (with EQ): |
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-10 dB: |
20 Hz |
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-3 dB: |
22 Hz |
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Recommended Crossover Frequencies: High-pass: 20 Hz, 12 dB/octave or greater Low-pass: 80 Hz to 150 Hz, 12 dB/octave or greater
Distortion9:
2nd harmonic: <0.6% 3rd harmonic: <0.8%
System Polarity: EIA Standard. Positive voltage to RED terminal produces forward cone motion.
Input Connectors: Color-coded push terminals
Net Weight: 63 kg (138 lbs.)
Shipping Weight: 69 kg (151 lbs.)
ENCLOSURE:
Materials and Finish: 19 mm (¾ in) particle board with 25 mm (1 in) baffle and back panel. Extensive bracing on all panels
Enclosure Tuning Frequency: 25 Hz
Net Internal Volume: 225 liters (8 cu. ft)
Dimensions: 1010 mm x 674 mm x 450 mm
H x W x D 39¾ in x 26½ in x 17¾ in
See footnotes on back
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