SPECIFICATIONS
APPEARANCE AND DIMENSIONAL DIAGRAM
Power Handling Capacity
Continuous Pink Noise
Continuous Program
Nominal Impedance
Frequency Response
Pressure Sensitivity
800Hz to 5kHz pink noise
4-meter measurement
distance referred to
1 meter
30 watts RMS band-limited pink noise
(800Hz to 20kHz)
90 watts
8 ohms (HFD-220-8)
16 ohms (HFD-220-16)
800Hz to 15kHz
110dB/W/m: LE-940 horn
112dB/W/m: LE-640 horn
114dB/W/m: LE-420 horn
108dB/W/m: LE-M124 horn
10SdB/W/m: LE-M94 horn
112dB/W/m: LE-M64 horn
114dB/W/m: LE-M42 horn
Recommended Crossover
Frequency
Throat Diameter
800Hz or higher
2" (49mm)
Polarity
Recommended Horn
Positive voltage to +terminal produces
negative acoustic pressure in the throat
LE-940, LE-640, LE-420
LE-M124, LE-M94, LE-M64, LE-M42
Magnet
Diaphragm
Voice Coil
Finish
Dimensions
Net Weight
Mounting Data
2.4 Ibs. (1.1 kg) Ferrite
Flux density: 19,000 gauss
Heat-treated 50-micron duralumin
1.76" (44.6mm) dia., edge-wound
copper-clad aluminum ribbon
Black NEW-ALKONE paint
5.98" (152mm) dia.
7.01" (178mm) depth
10.6 Ibs. (4.8kg)
Four studs [0.24" (6mm) dia.] equally
spaced on a 4" (101.6mm) dia. circle
1. Measurement conditions:
The above electrical and acoustic data are measured in conjunction with TOA’s LE-M94 horn.
2. Duration of power handling test is 24 hours.
*Specifications are subject to change without notice.
ARCHITECT’S AND ENGINEER’S
SPECIFICATIONS
The compression driver shall be the TOA HFD-220-8/16, in 8-ohm or 16-
ohm versions, or an approved equivalent. Power handling capacity shall
be 90 watts of continuous program, 30 watts RMS band-limited pink noise
(800Hz to 20kHz), with a smooth frequency response from 800Hz to
15kHz. Pressure sensitivity with the LE-940 horn shall be 110dB/Wm,when
measured at a referred 1 -meter distance on an axis from the mouth of the
LE-940 with 1-watt input pink noise, band limited from 800Hz to 5kHz, and
the recommended crossover frequency shall be 800Hz or higher. Nominal
impedance shall be 8 ohms for the HFD-220-8 and 16 ohms for the
HFD-220-16. The unit’s throat diameter shall be 2 in. (49mm). The voice
coil shall consist of a 1.76in. (44.6mm) edge-wound, copper-clad
aluminum ribbon coupled to a 50-micron hard duralumin diaphragm.
The diaphragm voice coil assembly shall be replaceable in the field
without requiring special tools or skills. The diaphragm voice coil shall
employ self-aligning dowels to center it perfectly in the voice coil gap.
The gap shall have a flux density of 19,000 gauss generated by a 2.4 lbs.
(1.1 kg) ferrite magnet. A machined phasing plug with three acoustic slots
shall serve as the pole piece, providing the proper phase relationship
between the sound emanating from the center and that coming from the
edge of the diaphragm/voice coil assembly. The driver shall be 598 in.
(152mm) in diameter by 7.01 in. (178mm) in depth, shall weigh 10.6 lbs.
(4.8kg), and shall have a black NEW-ALKONE paint finish. Mounting shall
be effected by four 6mm studs, equally spaced on a 4in. (101.6mm)
diameter circle.
66.0" (152mm) DIA
EQUALIZATION
When using the HFD-220-8/16 driver in combination with the LE Series
constant directivity horn and the TOA “SAORI” integrated sound
processor, set the long delay type horn equalizer (IS-110DL4, IS-110DL2)
built into the digital channel divider module of the “SAORI” as shown in the
table below.
LE-940 LE-640 LE-420 LE-M124 LE-M94 LE-M64
LE-M42
HFD-220-8/16
TYPE 6
TYPE 6 TYPE 7 TYPE 8
TYPE 8
TYPE 8
TYPE 9
CHARACTERISTIC DIAGRAMS
• Frequency Response and Impedance
*4-meter measurement distance referred to 1 meter, 1W, sine wave.
• Harmonic Distortion
*4-meter measurement distance referred to 1 meter, 1W, sine wave.
• Frequency Response with Horn EQ
*4-meter measurement distance referred to 1 meter, 1W, sine wave, with Horn EQ Type 6
(LE-940), Type 8 (LE-M94)
Electronics, Inc., 601 Gateway Boulevard
South San Francisco, California 94080
Telephone: (415) 588-2538
FAX (415) 588-3349
© 1991 TOA Electronics, Inc.
Printed in USA 07-91
