Jbl 2227 h brochure

Page 1

JBL

Maximum Output 380 mm
SVGTM Transducer

Professional Series

Key Features:

600 watt continuous pink noise
power

V 100 mm (4 ) edgewound
aluminum ribbon voice coil

50 Hz to 3 kHz response
M00 dB sensitivity, 1 W at 1 In

New magnet structure with
Super Vented Gapm (SVG) cooling

>Extremely high, wide-band output
capability with low distortion

The JBL 2227H low frequency trans-
ducer incorporates JBL s ongoing
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-
tures - a direct improvement in power
compressron.

The 2227H 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 2227H 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 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 3 transient response. The
new voice coil-magnet circuitry is
referred to as Super Vented GapM
technology.

us. Pm. 5,042,072 Foreign patents pending.

The 2227H is intended for use in applications where large amounts of low
distortion wide-band acoustical power is required, along with excellent mid-
bass transient behavior. It is ideal for such applications as stage monitoring
systems, with their typical small enclosures, and as a driver for bass and mid-
bass horns. The total peak-to-peak excursion of the moving system is 10 mm,
within 10% linearity. JBL does not recommend the use of the 2227H transduc-
er in subwoofer systems.

With a top plate that is 50% thicker than the 2226 driver, the 2227H has
more effective heat sinking to dissipate heat to the surrounding metal parts.
The power rating, with reduced power compression and increased efficiency,
give the 2227H a net continuous wide-band output capability that is more than
4 dB greater than that of the 2226H.

Careful attention has been paid to the design of the moving system. The
cone used in the 2227H 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

> 2227H Maximum Output 380 mm SVGTMTransducer

Specifications:

Nominal Diameter:

380 mm (15")

Rated Impedance:

8 ohms

Power Capacit :

Sensitivity '

'100 dB, 1w, 1 m (3.3 fl)

Typical Response and Impedance
Curves, Enc osure Volume and
Port Tuning

Frequency Rangei50 HZ - 3 kHz

Power Compression
@ -10 dB power (60 W):
@ -3 dB power (300W):

@ rated power (600 W):

oat-no
mum
in. a.
{flaw

Distortion
2nd harmonic:
3rd harmonic:

< 1.0%
< 1.0%

Highest Recommended Crossover:

1.6 kHz

Recommended Enclosure volume:

60 <1801(2 >6 fti)

Effective Piston diameter:

534 mm (13.2 in)

Maximum Excursion
Before Damage (peak to peak):

50 mm (2 in)

Minimum Impedance:

6.85 ohms

Voice Coil Diameter

: 100 mm (4 in)

Voice Coil Material

: Edgewound Aluminum Ribbon

Voice Coil Winding Depth

: 17.8 mm (0.7 in)

Magnetic Gap Depth:

12.7 mm (0.5 in)

Magnetic Assembly Weight: 10.4 kg (23 lb)

BI factor

: 23 newton/ampere

Effective Moving Mass: 99 g

Polarity:

EIA (Positive voltage to RED
terminal gives forward cone
motion)

THIELE-SMALL PARAMETERS:

rt

(mundane: (ohms)

B

Frequency response contour of the 2227H taken in a
hemispherical free-field environment, a closed box of 280
1 (10 ft) 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 response. The dashed curve rep-
resents the response when the driver is mounted in a 140
1 (5 ft) vented enclosure tuned to 40 Hz. The imped-
ance magnitude curve is measured in free-air.

Distortion vs. Frequency

f: 40 Hz
R: 4.7 ohms
Q: 0.21 2
at
Q..,.: 5 5
Q: 0.22 i
V: 175 1 (6.2 ft) Err
a.
s: 0.088 nt=(137 inl) s
x x: 5 mm (0.2 in) 3.
V: 440 cm (27 in)
L; 0.55 th
Tin (half-space): 4.9% l xqummii m
Pe (Max): 600 W, continuous pink noise

MOUNTING INFORMATION:

Overall Diameter:

388 mm (15.25 in)

Bolt Circle Diameter: 370 mm (14.56)

Baffle Cutout Diameter

Front Mount: 352 mm 13.85 in)

Rear Mount
Dept '

: 355 mm 14 in)
. 152 mm 6 in)

Volume Displaced by Driver: 7

1 (0.25 it)

Net Weight

: 11.8 kg (26 1b)

Shipping Weight: 13.2 kg (29 lb)

AES standard (5050:) Hz)

Sensitivity is based on a too . 1000 Hz pinlr noise signal for an input of 2.x; V (o 8 ohms.
Frequency range is defined as the frequency extremes met which the response is 43 dB
relative to rated sensitivity,

Power compression is the Sensitivity loss at the specified power, measured irom 50 to no
112. .titer a 5 minute AES standard pink noise preconditioning test at the speciiied pnwer,
Distortion is measured at .13 dB rating powirr from 100 to 500 Hz.

ThielerSmall parameters are measured after 2 hour exercise period using in 630 w AES
power rest and will reflect the expected long term parameters once the driver has been
installed and operated for a shun period of time.

Clearance of at least 70 mm (3 m) must be prmided behind the magnet assembly and the
gap tents to allow sufficient .ttr circulation and proper cooling to take place.

Distortion levels raised 20 dB, measured at 60 watts,
1 meter.

JEL continually engages in research related to product improvement New materials.
production methods and design refinements are tntroduced into extstlng products snthnut notice as a
routine expression or [lull philosophy For this reason, any current JBL product may differ tn some
respect rtntn tts published dcsctipuon but will always equal or exceed the original destgn
spectncuttons unless Otherwfie stated.

UBL

JBL Professional
8500 Balboa Boulevard, PO. Box 2200

. . . ss 222m
Northrldge, Callfornla 91329 USA. Cpp W
H A Harman Imemalional Company 10/96