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The JBL 4641 Cinema Series 18" Passive Subwoofer utilizes the company's patented Vented Gap Cooling (VGC) process to pump air over and around the unit's 4" voice coil to improve heat transfer, reduce operating temperature, increase power handling, and reduce power compression within a direct radiator bass-reflex enclosure. The driver handles 1200 Watts of continuous program power to deliver a usable frequency response down to 22 Hz (-10 dB) with external EQ processing.
The 4" voice coil benefits from a winding technique that offers greater thermal stability and increased power handling. All elements of the cone, voice coil and suspension system are optimized for a smooth high frequency response. The subwoofer's magnet structure and compliance enable long peak-to-peak excursions without damage to the speaker.
The dense particle board enclosure is equipped with an extra-large front panel port, and the cabinet is tuned to a low 25 Hz. The subwoofer is designed primarily for professional use in cinema and screening room installations, although the unit will work reliably in most general sound reinforcement applications. The unit is officially approved by Lucas Films Ltd. for certified THX applications with both analog and digital soundtracks.
Passive Cinema Series installation subwoofer with 18" woofer and tuned, ported enclosure
Approved by Lucasfilm, Ltd. for THX installations
600 watts continuous pink noise, 1200 watts continuous program power handling
Reliable frequency reproduction down to 25 Hz (-10 dB, no EQ), flat to 25 Hz(-3 dB, external EQ)
Large 4" voice coil for driver
VGC(Vented Gap Cooled) transducer reduces operating temperature and power compression, increases power handling
Computer-aided transducer magnet design for flux density, field saturation, lowered weight and improved harmonic distortion
High sensitivity, high SPL capability, and low distortion
Dense, ported, 0.75" particle board enclosure tuned to 25 Hz with cabinet baffle and back panel with bracing on all panels
In the Box
JBL 4641 Cinema Series 18" Passive Subwoofer
Limited 5-Year Warranty
Table of Contents
25 to 500 Hz, -10 dB
Lower Frequency Limits: 25 Hz, -10 dB, no eq 35 Hz, -3 dB, no eq 22 Hz, -10 dB, with external eq 25 Hz, -3 dB, with external eq
600 W (continuous pink noise) 1200 W (continuous program) 2400 W (peak program)
Maximum Sound Pressure Level (SPL)
125 dB at 1 m (continuous) 131 dB @ 1 m (peak)
50 to 500 Hz: 98 dB, (1 W at 1 m) 40 to 100 Hz: 97 dB, (1 W at 1 m)
6.3 Ohms 8 Ohms(Rated)
High Pass: 20 Hz, 24 dB/octave or greater(recommended) Low Pass: 80 Hz - 150 Hz, 12 dB/octave or greater(recommended)
18" Vented Gap Cooled with 4" Voice Coil
.75"(19 mm) Particle board with 1"(25 mm) baffle and back panel
Color-coded push terminals
39.00 x 25.50 x 17.75" (991 x 648 x 451 mm)
131 lb (60 kg)
JBL 4641 Cinema Series 18" Passive Subwoofer Review