JBL 4641 User Manual

4641

Single 460 mm (18 in) Subwoofer System

SPECSHEET

Key Features:

• 600 W (60 V) AES 2-hour power rating

• Usable response to 25 Hz (-10 dB) with no EQ; flat to 25 Hz (-3 dB) with external EQ

• 2241H VGC™ (Vented Gap Cooled) driver provides long peak-to-peak excursion, high
sensitivity and high maximum SPL capability

• SFG™ (Symmetrical Field Geometry) magnet structure for low 2nd and 3rd harmonic
distortion

• Approved by Lucasfilm, Ltd. for THX® installations

Description:

The JBL 4641 is a high quality subwoofer system, featuring a technologically advanced 460 mm (18 in) low frequency transducer mounted in a direct

radiator, bass-reflex enclosure for smooth response to the lowest audible frequencies. The 4641 is ideal for low frequency augmentation of either analog

or digital soundtracks in motion picture theaters and for general sound reinforcement applications. 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 600-watt continuous AES pink noise power rating.

Specifications:

Component Electronics – Model 2241H

Low Frequency Transducer 1 x 2241H, 460 mm (18 in)
Rated Impedance 8 ohms
Minimum Impedance 6.3 ohms

Power Handling Capability

Input Power Handling
(AES 100-Hour Rating)

Input Power Handling
(AES 2-Hour Rating)

Output Capability

1

Sensitivity

Max Continuous SPL @ 1 meter
Max Peak SPL @ 1 meter
Frequency Response

2

3

450 W (60 Vrms), pink/IEC

600 W (69 Vrms), pink/IEC

40 Hz – 100 Hz; 97 dB, 1 W @ 1 m; reference

2.83 V
Single

Module

2

125 dB 131 dB 136 dB 140 dB
131 dB 137 dB 142 dB 146 dB
Lower Frequency Limits (no EQ):

-10 dB: 25 Hz

-3 dB: 35 Hz
Lower Frequency Limits (with EQ):

-10 dB: 22 Hz

-3 dB: 25 Hz

Two
Modules

Four
Modules

Eight
Module

Other

Recommended Crossover
Frequencies

System Polarity EIA Standard. Positive voltage to RED terminal

Input Connectors Color-coded push terminals
Net Weight 60 kg (131 lb)
Shipping Weight 66 kg (142 lb)

High-pass: 20 Hz, 24 dB/octave or greater
Low-pass: 80 Hz to 150 Hz, 12 dB/octave or
greater

produces forward cone motion.

Enclosure

Materials and Finish 19 mm (0.75 in) particle board with 25 mm (1

Enclosure Tuning Frequency 25 Hz
Net Internal Volume 225 liters (8 cubic ft)
Dimensions (H x W x D) 1010 mm x 674 mm x 450 mm

1

Averaged half-space (2pi). Quarter-space (1pi, wall/floor junction placement) is 6 dB

higher.

2

Per industry practice, maximum long-term SPL is a calculation that references half-

space 1W/1m sensitivity, scaled by the long-term continuous power rating.

3

Based upon specified sensitivity, 40 Hz to 100 Hz.

JBL continually engages in research related to product improvement. Some materials,
production methods and design refinements are introduced into existing products
without notice as a routine expression of that philosophy. For this reason, any current
JBL product may differ in some respect from its published description, but will always
equal or exceed the original design specifications unless otherwise stated.

in) baffle and back panel; extensive bracing on
all panels

(39.75 in x 26.50 in x 17.75 in)

THX is a trademark of THX Ltd. which may be registered
in some jurisdictions. All rights reserved.

*U.S. Patent #5,042,072. Foreign Patents Pending.

Note: specifications are subject to change without notice.
12/2018. © 2018 Harman International. www.jblpro.com

4641

Single 460 mm (18 in) Subwoofer System

SPECSHEET

Dimensions: Graphs:

Frequency Response

Note: Drawing not to scale. All dimensions are for reference only.

The 100 mm (4 in) voice coil benefits from a new winding

technique which offers greater thermal stability with increased

power handling. All elements of the cone, voice coil and

suspension system have been carefully optimized and controlled

to ensure smooth high frequency response.

The magnet structure and compliance allow for long peak-to-

peak excursions without damage to the speaker. Symmetrical

Field Geometry (SFG) minimizes second harmonic distortion.

Enclosure: The enclosure is constructed of dense stock and is

extensively braced on all panels. It has a net internal volume of

225 liters (8 cu. ft.) and is tuned to 25 Hz with a very large port

to minimize port compression and to reduce distortion due to

turbulent air flow.

1 watt at 1 meter, with 150 Hz Linkwitz-Riley 4th order low-pass filter

and 2nd order high-pass filter at 25 Hz with Q=2. 1pi (upper curve)

and 2pi (lower curve) conditions.

Frequency Response: The 4641 is intended for use as a

subwoofer with a low-pass filter and appropriate high-pass

filtering for protection and equalization.