460 MM (18 In) Low Frequency Transducer: Professional Series

2241H
460 mm (18 in)

Low Frequency
Transducer
Key Features:
600 W continuous pink noise
power capacity
100 mm (4 in) edgewound
aluminum ribbon voice coil
30 Hz - 3 kHz response
98 dB sensitivity, 1 W, 1 m (3.3 ft)
SFG magnet structure with patented
Vented Gap Cooling
TM
technology
1
The JBL 2241H low frequency
transducer represents the results of
JBLs industry-leading engineering
research in high power transducer
design. The 2241H signified a major
advance in speaker design by incor-
porating JBLs patented Vented Gap
Cooling
TM
technology
1
in an improved
Symmetrical Field Geometry (SFG)
magnetic structure.
To increase power handling while
reducing power compression, JBL
engineers created a unique method
called direct voice-coil-to-air heat dis-
sipation (Vented Gap Cooling). This
process pumps air through the mag-
netic 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 computer-aided
magnet optimization and analysis
techniques, JBL engineers were able
to optimize both magnet weight, ux
density and eld saturation resulting
in a signicant reduction in harmonic
distortion. This new magnet structure
offers much of the weight advantage
of rare earth magnet structures with-
out the higher cost.
1
U.S. Patent #5,042,072. Foreign patents pending.
Specications:
Nominal Diameter: 460 mm (18 in)
Rated Impedance: 8 ohms
Power Capacity
1
: 600 W continuous pink noise
Sensitivity
2
: 98 dB SPL, 1 W, 1 m (3.3 ft)
Frequency Range
3
: 30 Hz - 3 kHz
Power Compression
4
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
Distortion
5
2nd harmonic: 1.0%
3rd harmonic: 1.0%
Highest Recommended Crossover: 800 Hz
Recommended Enclosure Volume: 140-340 l (5-12 ft
3
)
Effective Piston Diameter: 397 mm (15.6 in)
Maximum Excursion Before
Damage (p-p): 40 mm (1.6 in)
Minimum Impedance: 6.0 ohms 10% @ 25C
Voice Coil Diameter: 100 mm (4 in)
Voice Coil Material: Edgewound aluminum 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)
Bl Factor: 19.2 N/A
Effective Moving Mass: 0.145 kg
Positive voltage on BLACK terminal gives forward diaphragm motion.
1
AES standard (50-500 Hz).
2
Sensitivity is based on a swept 100 Hz to 500 Hz signal for an input of 2.83 V @ 8 ohms or 2.0 V @ 4 ohms.
3
Frequency range is dened as the frequency extremes where the response is -10 dB from the rated sensitivity.
4
Power compression is the sensitivity loss at the specied power, measured from 50 to 500 Hz, after a 5 minute
AES standard (50-500 Hz) pink noise preconditioning test at the specied power.
5
Distortion is measured at -10 dB rated power, from 100-500 Hz.
JBL continually engages in research related to product improvement. New materials, production methods, and design
renements 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 specications unless otherwise stated.
Professional Series
70708_JBL.2241H 7/23/03 11:35 AM Page 1
2241H 460 mm (18 in) Low Frequency Transducer
SS 2241
CRP 5M
04/08
Typical Response and Impedance Curves, Enclosure
Volume and Port Tuning
Frequency response contour of the 2241H taken in a hemispherical
free-eld environment, a closed box of 280 l (10 ft
3
) internal volume
enclosing the rear of the driver. Measured response of a typical pro-
duction 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 ft
3
) vented enclosure tuned
to 30 Hz using a port with an area of 320 cm
2
(50 in
2
) 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.
With very high thermal power handling, special atten-
tion 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 benets from a
new winding technique which offers greater thermal sta-
bility with increased power handling. All elements of the
cone, voice coil and suspension system have been careful-
ly optimized and controlled to ensure smooth high fre-
quency response.
The 2241H is ideally suited for use in touring and xed
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.
THIELE/SMALL PARAMETERS
6
:
f
s
: 35 Hz
R
e
: 5.0 ohms
Q
ts
: 0.40
Q
ms
: 5.7
Q
es
: 0.43
V
as
: 310 l (11.0 ft
3
)
S
D
: 0.124 m
2
(192.4 in
2
)
X
max
: 7.6 mm (0.30 in)
V
D
: 942 cm
3
(57.7 in
3
)
L
e
: 1.75 mH
o
(Half space)
2
: 2.9%
P
e
(Max)
1
: 600 W continuous pink noise
MOUNTING INFORMATION:
Overall Diameter: 464 mm (18 in)
Bolt Circle Diameter: 441 mm (17 in)
Bafe Cutout Diameter
Front Mount: 427 mm (16 in)
Rear Mount: 428 mm (16 in)
Depth
7
: 191 mm (7 in)
Volume Displaced by
Driver: 8.51 (0.3 ft
3
)
Net Weight: 10 kg (22 lb)
Shipping Weight: 10.9 kg (24 lb)
6
Thiele/Small parameters are measured after a 2 hour exercise period using a 600 W
AES power test and will reect the expected long term parameter values once the driver
has been installed and operated for a short period of time.
7
Clearance of at least 76 mm (3 in) must be provided behind the magnet assembly and
the gap vents to allow sufcient air circulation and proper cooling to take place.
JBL Professional
8500 Balboa Boulevard, P.O. Box 2200
Northridge, California 91329 U.S.A.
www.jblpro.com
Copyright 2003 JBL Professional
A Harman International Company
70708_JBL.2241H 7/23/03 11:35 AM Page 2

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2241H

460 mm (18 in)

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