SPECIFICATIONS
APPEARANCE AND DIMENSIONAL DIAGRAM
Power Handling Capacity
Continuous Pink Noise
Continuous Program
Nominal Impedance
Frequency Response
Pressure Sensitivity
500Hz-5kHz pink noise
4-meter measurement
distance referred to
1 meter
50 watts RMS, band-limited pink noise
(500Hz to 20kHz)
150 watts
8 ohms (HFD-260-8)
16 ohms (HFD-260-16)
500Hz to 18kHz
111 dB/W/m: LE-940 horn
113dB/W/m: LE-640 horn
115dB/W/m: LE-420 horn
109dB/W/m: LE-M124 horn
110dB/W/m: LE-M94 horn
113dB/W/m: LE-M64 horn
115dB/W/m: LE-M42 horn
Recommended Crossover
Frequency
Throat Diameter
500Hz 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
7.1 Ibs. (3.2kg) Ferrite
Flux density: 22,000 gauss
Heat-treated 50-micron duralumin
2.83" (72mm) dia., edge-wound
copper-clad aluminum ribbon
Black NEW-ALKONE paint
8.86" (225mm) dia.
6.14" (156mm) depth
25.4 Ibs. (11.5kg)
Four studs [0.24" (6mm) dia.] equally
spaced on a 4" (101.6mm) dia. circle
Notes:
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-260-8/16, in 8-ohm or
16-ohm versions, or an approved equivalent. Power handling capacity
shall be 150 watts of continuous program, 50 watts RMS band-limited
pink noise (500Hz to 20kHz), with a smooth frequency response from
500Hz to 18kHz. Pressure sensitivity with the LE-940 horn shall be
111dB/W/m, when measured at a referred 1-meter distance on an axis
from the mouth of the LE-940 with l-watt input pink noise, band limited
from 500Hz to 5kHz, and the recommended crossover frequency shall
be 500Hz or higher. Nominal impedance shall be 8 ohms for the
HFD-260-8 and 16 ohms for the HFD-260-16. The unit’s throat diameter
shall be 2 in. (49mm). The voice coil shall consist of a 2.83 in. (72mm)
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
22,000 gauss, generated by a 7.1 Ibs. (3.2kg) 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 8.86 in. (225mm) in
diameter by 6.14 in. (156mm) in depth, shall weigh 25.4 Ibs. (11.5kg),
and shall have a black NEW-ALKONE paint finish. Mounting shall be
effected by four 6mm studs, equally spaced on a 4 in. (101.6mm)
diameter circle.
EQUALIZATION
When using the HFD-260-8/16 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
HFD-260-8/16 TYPE 1
LE-640 LE-420 LE-M124 LE-M94 LE-M64 LE-M42
TYPE 1 TYPE 2 TYPE 3 TYPE 2 TYPE 2 TYPE 5
CHARACTERISTIC DIAGRAMS
• Frequency Response and Impedance
*4-meter measurement distance referred to 1
• Harmonic Distortion
1W, sine wave.
1W, sine wave.
• Frequency Response with Horn EQ
*4-meter measurement distance referred to 1 meter, 1W, sine wave, with Horn EQ Type 1
(LE-940) Type 2 (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
