JBL 2242-H Brochure
Professional Series
Key Features:
800 watt continuous pink noise
power
100 mm (4”) edgewound aluminum
ribbon voice coil
25 Hz to 1.6 kHz response
99 dB sensitivity, 1 W at 1 m
New magnet structure with patented
Super Vented Gap
Extremely high output capability
with low distortion
The JBL 2242H low frequency transducer incorporates JBL’s ongoining
developments in improved thermal
dissipation and linearity at both high
and low cone excursions. To increase
power handling while minimizing
power compression, JBL’s engineers
have developed a patented voice-coilto-air heat dissipation method known
as Vented Gap CoolingTM. This process
pumps air through the magnetic gap
and directly over and around the voice
coil to provide immediate heat transfer
and reduction of operating temperature - a direct improvement in power
compression.
The 2242H is built around a completely new motor structure with a
pole piece extending both above and
below the top plate to improve gap
flux symmetry and increase thermal
conductivity from the voice coil to the
pole piece. In addition to the benefits
of JBL’s Symmetrical Field GeometryTM,
the 2242H also incorporates a copper
shorting ring that is imbedded in the
pole piece at the precise center of the
gap and is in close proximity to the
voice coil. The copper ring acts like a
shorted secondary turn in a transformer, with the voice coil acting as
the primary winding. The benefits of
this are a reduction in third harmonic
distortion and a reduction of the voice
coil’s inductance, which improves the
transducer’s transient response.
l
U.S. Patent #5,042,072. Foreign patents pending
1
TM
(SVG) cooling
Maximum Output 460 mm
2242H
1
The 2242H can produce peak instantaneous outputs of 134 dB above 100
Hz measured at one meter, greater than any other JBL low frequency transducer. The new voice coil-magnet circuitry is referred to as Super Vented Gap
technology.
The 2242H is intended for use in applications where large amounts of low
distortion low frequency acoustical power is required, along with excellent
mid-bass transient behavior. A typical application is as a subwoofer for cinemas, with extension down to 25 Hz. The total peak-to-peak excursion of the
moving system is 18 mm, within 10% linearity.
The 2242H carries a power rating of 800 watts, as compared with the 600
watt rating of its predecessors. This is accomplished through the use of a
voice coil with one-third more surface area than in the earlier designs, allow-
ing the 2242H to dissipate heat more effectively to the surrounding metal
parts, The higher power rating, reduced power compression, and increased
efficiency give the 2242H a net continuous output capability that is 3 dB
greater than that of the 2241H.
Careful attention has been paid to the design of the moving system. The
cone used in the 2242H is reinforced with fiberglass for added strength. The
inner suspension is a JBL design whose “stress-strain” curve has been chosen
to produce better control of cone motion at the highest excursions.
SVGTMTransducer
TM
2242H Maximum Output 460 mm SVG
TM
Transducer
Specifications:
Nominal Diameter: 460 mm (18”)
Rated Impedance: 8 ohms
Power Capacity1: 800 watts
Sensitivity2 99 dB, lW, 1 m (3.3 ft)
Frequency Range3 25 Hz - 1.6 kHz
Power Compression
d -10 dB power (80 W): 0.6 dB
@ -3 dB power (400W): 2 dB
@ rated power (800 W): 3.3 dB
Distortion
2nd harmonic: <1.0%
3rd harmonic: <1.0%
Highest Recommended Crossover: 1 kHz
Recommended Enclosure volume: 140 - 340 1 (5 - 12 ft3)
Effective Piston diameter: 397 mm (15.6 in)
Before Damage (peak to peak): 50 mm (2 in)
THIELE-SMALL PARAMETERS6:
1
AES standard (50 500 Hz)
2
Sensitivity is based on a 100 - 1000 Hz pink noise signal for an input of 2.83 V @ 8 ohms.
3
Frequency range is defined as the frequency extremes over which the response is -10 dB
relative to 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 pink noise preconditioning test at the specified power.
5
Distortion is measured at -10 dB rating power, from 100 to 500 Hz.
6
Thiele-Small parameters are measured after 2 hour exercise period using an 600 W AES
power test and will reflect the expected long term parameters 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.
Maximum Excursion
Minimum Impedance: 6.6 ohms
Voice Coil Diameter: 100 mm (4 in)
Voice Coil Material: Edgewound Aluminum Ribbon
Voice Coil Winding Depth: 25 mm (1 in)
Magnetic Gap Depth: 12.7 mm (0.5 in)
Magnetic Assembly Weight: 10.4 kg (23 lb)
Effective Moving Mass: 158 g
710
(half-space): 4%
Pe (Max)1: 800 W, continuous pink noise
MOUNTING INFORMATION:
Overall Diameter: 464 mm (18.27 in)
Bolt Circle Diameter: 441 mm (17.38)
Baffle Cutout Diameter
Volume Displaced by Driver: 9 1 (0.32 ft3)
Front Mount: 427 mm (16.81 in)
Rear Mount: 428 mm (16.85 in)
Net Weight: 13.2 kg (29 lb)
Shipping Weight: 15 kg (33 lb)
4
5
Bl factor: 23.7 newton/ampere
Polarity: EIA (Positive voltage to RED
Denth7: 203 mm (8 in)
terminal gives forward cone
motion)
fs: 35 Hz
Re 4.7 ohms
Qts: 0.28
Qms: 5
Qes: 0.29
Vas: 283 1 (10 ft3)
SD: 0.124 m2 (192 in2)
Xmax: 9 mm (0.35 in)
VD: 1114 cm3 (GS in3)
Le: 1.25 mH
Typical Response and Impedance
Curves, Enclosure Volume and Port
Tuning
Frequency response contour of the 2242H taken in a
hemispherical free-field environment, a closed box of 280
1 (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 mea-
sured 45 degree off-axis response. The dashed curve rep-
resents the response when the driver is mounted in a 225
1 (8 ft3) vented enclosure tuned to 30 Hz. The imped-
ance magnitude curve is measured in free-air.
Distortion vs. Frequency
Distortion levels raised 30 dB, measured at 80 watts, 1
meter.
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.
JBL Professional
8500 Balboa Boulevard, P.O. Box 2200
Northridge, California 91329 U.S.A.
n
A Harman International Company
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