2241 H 2241 H
2241 H
2241 H
Low Frequency Transducer
Low Frequency Transducer
600 watts continuous pink noise
power capacity
100 mm (4 in) edgewound
aluminium ribbon voice coil
30 Hz - 3 kHz response
98 dB sensitivity, 1W, 1m (3.3 ft)
SFG magnet structure with
Vented Gap Cooling® technology
The JBL 2241H low frequency transducer represents the results of JBL’s latest engineering
research in high power transducer design. The
2241H signifies a major advance in speaker
design by incorporating JBL’s patented Vented
Gap Cooling® technology in an improved
Symmetrical Field Geometry (SFG) magnetic
To increase power handling while reducing
power compression, JBL engineers have
created a unique, direct voice coil-to-air heat
dissipation method called Vented Gap
Cooling. This process pumps air through the
magnetic gap and directly over and around the
voice coil to provide immediate heat transfer
and reduction in operating temperature - a direct improvement in power compression.
Through the use of new computer-aided magnet optimization and analysis techniques, JBL
engineers were able to optimize both 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 new magnet
structure offers much of the weight advantage
of rare earth magnet structures without the
prohibitive cost.
With increased power handling, special
attention was paid to increased mechanical
integrity. A new cone design which greatly
improves cone strength allows for increased
reliability and longer life. Greater linear
excursion for matched power and displacement levels was achieved via a new surround
topology and edge damping treatment.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
U.S. Patent #5,042,072. Foreign patents pending.
ηo (Half space)2:
Pe (Max)3:
optimized and controlled to ensure smooth
high frequency response. In most applications, the 2241H can provide more low
frequency response, 3 dB more output and
less distortion than the 2240G/H, with
little or no enclosure retuning. The
2241H is ideally suited for use in touring
and fixed sound applications where high
SPL and deep bass response are required.
Its low distortion and smooth frequency
response make the 2241H suitable for
critical monitoring applications as well.
Nominal Diameter: 460 mm (18 in)
Rated Impedance: 8 Ω
Power Capacity1: 600 W continous pink noise
Sensitivity2: 98 dB SPL, 1W, 1m
Frequency Range3: 30 Hz - 3 kHz
Power Compression4:
at -10 dB rated power ( 60 W): 0.8 dB
at -3 dB rated power (300 W): 2.6 dB
at rated power (600 W): 4.3 dB
2nd harmonic: 1.0 %
3rd harmonic: 1.0 %
Highest Recommended Crossover: 800 Hz
Recommended Enclosure Volume: 140 - 340 l (5 - 12 ft3)
Effective Piston Diameter: 397 mm (15.6 in)
Maximum Excursion:
Before Damage (p-p): 40 mm
Minimum Impedance: 6.0 Ω ±10% @ 25°C
Voice Coil Diameter: 100 mm (4 in)
Voice Coil Material: Edgewound aluminium ribbon
Voice Coil Winding Depth: 19.05 mm (0.75 in)
Magnetic Gap Depth: 8.1 mm (0.32 in)
Magnetic Assembly Weight: 6.8 kg (15 lb)
BI Factor: 19.2 N/A
Effective Moving Mass: 0.145 kg
Positive voltage on black terminal gives forward diaphragm motion.
AES standard (50 - 500 Hz).
Sensitivity is based on a swept 100 Hz to 500 Hz signal for an input of 2.83 V @ 8 ohms.
Frequency range is defined as the frequency extremes where the response is -10 dB from the rated senstivity.
Power compression is the sensitivity loss at the specified power, measured from 50 to 500 Hz, after a 5 minute
AES standard (50-500 Hz) pink noise preconditioning rest at the specified power.
Distortion is measured at -10 dB rated power, from 100 Hz - 500 Hz.
JBL continually engages in research related to product improvement. New 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.
© 1999 audioproheilbronn • Hünderstraße 1 • 74080 Heilbronn • Telefon (0 71 31) 92 11 60 • Fax (0 71 31) 92 11 11
Overall Diameter:
Bolt Circle Diameter:
Baffle Cutout Diameter:
Front Mount:
Rear Mount:
Volume Displaced by Driver:
Net Weight:
Shipping Weight:
35 Hz
5.0 Ω
310 l (11.0 ft3)
0.124 m2 (192.4 in2)
7.6 mm (0.30 in)
942 cm3 (57.7 in3)
1.75 mH
600 W continous pink noise
464 mm (18 in)
441 mm (173/8 in)
427 mm (16 13/16 in)
428 mm (16 55/64 in)
191 mm (7 16/25 in)
8.5 l (0.3 ft3)
10.7 kg (23 lb)
12.6 kg (27 lb)
Thiele/Small parameters are measured after a 2hour exercise period using a 600 W AES power test and will reflect the
expected long term parameter values once the driver has been installed and operated for a short period of time.
Sensitivity is based on a swept 100 Hz to 500 Hz signal for an input of 2.83 V @ 8 ohms.
AES standard (50 - 500 Hz).
Clearence of at least 76 mm (3 in) must be provided behind the magnet assembly and the gap vents to allow sufficient
air circulation and proper cooling to take place.
Typical Response and Impedance Curves,
Enclosure Volume and Port Tuning
Frequency response contour of the 2241H
taken in a hemispherical free-field environment,
a closed box of 280 l (10 ft3) internal volume
enclosing the rear of the driver. Measured response of a typical production unit, including all
peaks and dips, does not deviate more than 2 dB
from the above curve. The dotted line represents
measured 45 degree off-axis response.
The dashed curve represents the response when
the driver is mounted in a 280 l (10 ft3) vented
enclosure tuned to tuned to 30 Hz using a port
with an area of 320 cm2 (50 in2) and a length of
20 cm (8 in). The impedance magnitude curve
is measured in free-air.
Distortion vs. Frequency
Distortion levels raised 20 dB, measured at
60 watts, 1 meter.
aph/MP • TDW Rehberg • 01.99
© 1999 audioproheilbronn • Hünderstraße 1 • 74080 Heilbronn • Telefon (0 71 31) 92 11 60 • Fax (0 71 31) 92 11 11
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