Jbl 2242 h brochure

Page 1

JBL

Maximum Output 460 mm
SVG MTransducer

Professional Series

Key Features:

F800 watt continuous pink noise
power

>100 mm (4 ) edgewound aluminum
ribbon v01ce coil

>25 Hz to 1.6 kHz response
99 dB sensitivity, 1 W at 1 m

bNew magnet structure with patented
Super Vented GapM(SVG) cooling

FExtremely high output capability
with low distortion

The JBL 2242H low frequency trans-
ducer 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-coil-
to-air heat dissipation method known
as Vented Gap Coolingm. 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 tempera-
ture - a direct improvement in power
compression.

The 2242H is built around a com-
pletely- 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 Geometrym,
the 2242H also incorporates a copper
shorting ring that is imbedded in the
pole piece at the precise center of the
gap and 1s in close proximity to the
vo1ce coil. The copper r1ng acts like a
shorted secondary turn 1n a trans-
former, 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
coils inductance, which improves the
transducer 5 transient response.

Us. Patent 15,042,072. Foreign patents pending

The 2242H can produce peak instantaneous outputs of 134 dB above 100
Hz measured at one meter, greater than any other JBL low frequency transduc-

er. 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 15 required, along With excellent
mid- bass transient behavior. A typical application is as a subwoofer for cine-
mas, 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.

Page 2

P 2242H Maximum Output 460 mm SVGTM Transducer

Specifications:

Nominal Diameter: 460 mm (18)

Rated Impedance: 8 ohms

Power Capacir 800 watts

Sensitivity=99 dB, 1W, 1 m (3.3 It)

Frequency Range25 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 It)

Effective Piston diameter: 397 mm (15.6 in)

Maximum Excursion
Before Damage (peak to peak): 50 mm (2 in)

Minimum Impedance: 6.6 ohms

Voice Coil Diameter: 100 mm (4 in)

Voice Coil Material: Edgewouncl 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)

Bl lactor: 23.7 newton/ampere

Effective Moving Mass: 158 g

Polarity: EIA (Positive Voltage to RED
terminal gives forward cone
motion)

THIELE- SMALL PARAMETERS:

Is: 35 Hz

Re 4.7 ohms

Q: 0.28

Qms: 5

Qes: 0.29

Vas: 283 1 (to it)

s,,: 0.124 m1(192 inl)

Xmax: 9 mm (0.35 in)

V,,: 1114 cm (GS ins)

Le: 1.25 mH

710 (hall-space): 4%

Pe (Max): 800 W, continuous pink noise

MOUNTING INFORMATION:

Overall Diameter: 464 mm (18.27 in)

Bolt Circle Diameter: 441 mm (17.38)

Baffle Cutout Diameter
Front Mount: 427 mm 16.81 in
Rear Mou 28 mm 16.85 in
Denth: 203 mm (8 in)

Volume Displaced by Driver: 9 1 (0.32 It?)

Net Weight: 13.2 kg (29 lb)

Shipping Weight: 15 kg (33 lb)

AES sundard (so 500 1.)

Sensitivity is laased on a lot) . icon 2 pink noise signal for an input of 2.83 V @ 2 ohms.
Frequency range is defined as the frequency extremes over wnien the response is .10 dB
relative to rated sensitivity

Power compression is the sensirinry loss at rlre specified power, rneasured trnna so to 330
Hz, afre. a 5 minute AES srandard pink noise preconditioning resr u the speeifred power.
Distortion is measured at 710 (3 rating power. from 100 to 300 Hz.

ThieleeSimll pararnerers are measured afrer 2 hour exercise period using an soc w AES
power rest and will reflect the expected long term paramerers once the driver nas been
insralled and nperared for a slum period of time.

clearanee oi u least 75 mm (3 in) must be provided behind the rnagner assembly and rne
gap vents ro allow sufficient air circulation and proper cooling to rake place

Typical Response and Impedance
Curves, Enclosure Volume and Port

tress.

emu-m (Ha)

Frequency response contour of the 2242H taken in a
hemispherical free-field environment, a closed box of 280
1 (10 fti) internal volume enclosing the rear of the driver.
Measured response of a typical production unit, includ-
ing 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 res onse. The dashed curve rep-
resents the response when the driver is mounted in a 225
1 (8 ft) vented enclosure tuned to 30 Hz. The imped-
ance magnitude curve is measured in free-air.

Distortion vs. Frequency

man-«w mxl

Distortion levels raised 30 dB, measured at 80 watts, 1
meter.

jBL eonunually engages in researen .elared to product inrprovernenr, New materials,
production mernnds and design refinemenrr are introduced into existing products without notice as a
routine expression at that philosophy, For this reason, any current JBL product may differ in some
respeer frnnr us published description but will always equal or exceed die original design
specifications unless otherwise srued.

UBL

JBL Professional
8500 Balboa Boulevard, P.O. Box 2200
Northridge, California 91329 U.S.A. SS 2242

CRP 10M
[1 A Harman truernarional Company 5/97