Overview

The JBL Model 4642A is a high quality subwoofer system, featuring an advanced technology 460 mm (18 in), low frequency transducers mounted in a direct radiator, bass-reflex enclosure for smooth response to the lowest audible frequencies. The 4642A is ideal for low-frequency augmentation of either analog or digital soundtracks in motion picture theaters and for general sound reinforcement applications.

Transducer:
The 2241H 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.

Through the use of computer-aided magnet optimization and analysis techniques, JBL engineers were able to optimize magnet weight, flux density and field saturation, resulting in a 2.6 kg (6.5 lb) reduction in overall driver weight and a significant reduction in harmonic distortion. This magnet structure offers much of the weight advantage of rare earth magnet structures without the prohibitive cost, enabling the system to carry a 1200 watt continuous AES pink noise power rating.

Features:

• 1200 Watts Continuous Pink Noise, 2400 Watts Continuous Program Power Handling


• Usable response to 22 Hz (-10 dB, no EQ), flat to 22 Hz (-3 dB) with External EQ


• 2241H VGCTM Vented Gap Cooled Drivers- High Sensitivity- Low Power Compression- High Maximum-SPL Capability- Low 2nd and 3rd Harmonic- Distortion- Symmetrical Field Geometry SFGTM- Magnet Structure- Long Excursion Capability


• Approved by Lucasfilm, Ltd. for THX installations






 
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Specifications:

• TRANSDUCERS: Two JBL Model 2241H 460 mm (18 in) Low Frequency Transducers


• SYSTEM:


• Rated Impedance: 4 ohms


• Minimum Impedance: 3.2 ohms


• POWER HANDLING CAPABILITY:Continuous Pink Noise: 1200 WattsContinuous Program: 2400 WattsPeak Power: 4800 Watts


• OUTPUT CAPABILITY:


• Axial Sensitivity:50 Hz to 500 Hz; 101 dB, 1W @ 1m40 Hz to 100 Hz; 100 dB, 1W @ 1m


• Power Compression:At -10 dB power (120 W): 0.8 dBAt -3 dB power (600 W): 2.6 dBAt rated power (1200 W): 4.3 dB


• FREQUENCY RESPONSE:Lower Frequency Limits (no EQ):-10 dB: 22 Hz-3 dB: 35 HzLower Frequency Limits (with EQ):-10 dB: 20 Hz-3 dB: 22 Hz


• Recommended Crossover Frequencies:High-pass: 20 Hz, 12 dB/octave or greaterLow-pass: 80 Hz to 150 Hz, 12 dB/octave or greater


• Distortion:2nd harmonic: <2%3rd harmonic: <2%


• System Polarity: EIA Standard. Positive voltage to RED terminal produces forward cone motion.


• Input Connectors: Color-coded push terminals


• Net Weight: 98 kg (216 lbs.)


• Shipping Weight: 109 kg (240 lbs.)


• ENCLOSURE:


• Materials and Finish: 19 mm (3/4 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: 506 liters (18 cu. ft)


• Dimensions: 762 mm x 1219 mm x 610 mm, H x W x D 30 in x 48 in x 24 in