JBL 2227-H Brochure

Professional Series

Key Features:

600 watt continuous pink noise

power

100 mm (4”) edgewound

aluminum ribbon voice coil

50 Hz to 3 kHz response

100 dB sensitivity, 1 W at 1 m

New magnet structure with

Super Vented Gap

Extremely high, wide-band output

capability with low distortion

The JBL 2227H low frequency transducer 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-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 tempera-

tures - a direct improvement in power

compression.’

The 2227H 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 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 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. The new voice coil-magnet circuitry is referred to as Super Vented Gap technology.

‘U.S. Patent #5,042,072 Foreign patents pending.

(SVG) cooling

Maximum Output 380 mm

2227H

The 2227H is intended for use in applications where large amounts of low distortion wide-band acoustical power is required, along with excellent midbass transient behavior. It is ideal for such applications as stage monitoring systems, with their typical small enclosures, and as a driver for bass and midbass 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 transducer 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.

SVG

Transducer

2227H Maximum Output 380 mm SVG

Transducer

Specifications:

Nominal Diameter: 380 mm (15")

Rated Impedance: 8 ohms

Power Capacity1: 600 watts

Sensitivity2 100 dB, lW, 1 m (3.3 ft)

Frequency Range3 50 Hz - 3 kHz

Power Compression

@ -10 dB power (60 W): 0.5 dB

@ -3 dB power (300W): 1.7 dB @ rated power (600 W): 3.2 dB

Distortion

2nd harmonic: <1.0%

3rd harmonic: <1.0%

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

THIELE-SMALL PARAMETERS6:

AES standard (50-500 Hz)

Sensitivity is based on a 100 - 1000 Hz pink noise signal for an input of 2.83 V @ 8 ohms.

Frequency range is defined as the frequency extremes over which the response is -10 dB relative to rated sensitivity.

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.

Distortion is measured at -10 dB rating power, from 100 to 500 Hz.

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.

‘Clearance of at least 76 mm (3 m) 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: 6.85 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)

Effective Moving Mass: 99 g

(half-space): 4.9%

Pe (Max)1: 600 W, continuous pink noise

MOUNTING INFORMATION:

Overall Diameter: 388 mm (15.25 in)

Bolt Circle Diameter: 370 mm (14.56)

Baffle Cutout Diameter

Volume Displaced by Driver: 7 1 (0.25 ft3)

Front Mount: 352 mm (13.85 in)

Rear Mount: 355 mm (14 in)

Net Weight: 11.8 kg (26 lb)

Shipping Weight: 13.2 kg (29 lb)

BI factor: 23 newton/ampere

Polarity: EIA (Positive voltage to RED

Depth7: 152 mm (6 in)

terminal gives forward cone motion)

fs: 40 Hz

Re: 4.7 ohms

Qts: 0.21

Qms:

Qes:

0.22

Vas:

175 1

(6.2 ft3)

SD: 0.088 m2 (137 in2)

: 5 mm (0.2 in)

max

Vn:

440 cm3 (27 in3)

Le: 0.55 mH

Typical Response and Impedance Curves, Enclosure Volume and Port Tuning

Frequency response contour of the 2227H 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 measured 45 degree off-axis response. The dashed curve represents 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

Distortion levels raised 20 dB, measured at 60 watts,

meter.

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

A Harman lnternational Company

SS 2227H CRP 5M 10/96