JBL 2241-H Brochure
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 CoolingTMtechnology
1
The JBL 2241H low frequency
transducer represents the results of
JBL’s industry-leading engineering
research in high power transducer
design. The 2241H signified a major
advance in speaker design by incorporating JBL’s patented Vented Gap
Cooling
TM
technology1in 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 dissipation (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 computer-aided
magnet optimization and analysis
techniques, JBL engineers were able
to optimize both magnet weight, flux
density and field saturation resulting
in a significant reduction in harmonic
distortion. This new magnet structure
offers much of the weight advantage
of rare earth magnet structures without the higher cost.
1
U.S. Patent #5,042,072. Foreign patents pending.
Specifications:
Nominal Diameter: 460 mm (18 in)
Rated Impedance: 8 ohms
Power Capacity1: 600 W continuous pink noise
Sensitivity2: 98 dB SPL, 1 W, 1 m (3.3 ft)
Frequency Range3: 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 ft3)
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% @ 25°C
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 defined as the frequency extremes where the response is -10 dB from the rated sensitivity.
4
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 test at the specified 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
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.
Professional Series
2241H 460 mm (18 in) Low Frequency Transducer
SS 2241H
CRP 10M
7/03
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 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.
With very high thermal 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 optimized and controlled to ensure smooth high frequency response.
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.
THIELE/SMALL PARAMETERS6:
fs: 35 Hz
Re:5.0 ohms
Qts: 0.40
Qms: 5.7
Qes: 0.43
Vas: 310 l (11.0 ft3)
SD: 0.124 m2(192.4 in2)
X
max
: 7.6 mm (0.30 in)
VD: 942 cm3(57.7 in3)
Le: 1.75 mH
o(Half space)2: 2.9%
Pe(Max)1: 600 W continuous pink noise
MOUNTING INFORMATION:
Overall Diameter: 464 mm (18¼ in)
Bolt Circle Diameter: 441 mm (17⅜ in)
Baffle Cutout Diameter
Front Mount: 427 mm (16¹³⁄₁₆ in)
Rear Mount: 428 mm (16⁵⁵⁄₆₄ in)
Depth7: 191 mm (7½ in)
Volume Displaced by
Driver: 8.51 (0.3 ft3)
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 reflect 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 sufficient 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
Loading...