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TOA SPEAKER SYSTEM
UNIFORM DIRECTIVITY HORNS
LE-940/LE-640/LE-420
DESCRIPTION
The LE Series uniform directivity horns employ original TOA
technology to meet the most stringent professional standards
in precision directivity control, high efficiency and quality
audio output. LE Series uniform directivity horns are ideal for
applications such as theaters, concert halls, auditoriums and
churches.
The designs of horizontal and vertical side walls in the LE
Series employ different equations, and the side walls are
arranged so the mouth of the speaker is an equiphase surface, permitting each sound wave to leave the horn’s open
end at the same instant. These design features combine to
create an ideal geometry for maintaining uniform sound dis-
persion, as well as for ensuring high efficiency across the low
frequency band.
Each horn in the LE Series is intended for systems with a
crossover point at 500Hz or higher, and each is rated at a
uniform frequency range of 630Hz to 16kHz at any point
within the rated coverage angle. Controlled coverage patterns
for the horns (horizontal by vertical) are LE-940: 90° x 40°;
LE-640: 60° x 40°; LE-420: 40° x 20°.
Each horn comes with a cast aluminum 2-inch (49mm)
diameter throat, for mating with the TOA HFD-651-8 or
HFD-651-16 driver through the optional YS-651 throat adaptor. The horn mouth is constructed of fiberglass reinforced
plastic, and has sufficient thickness to suppress unnecessary
resonance. The mouth and throat are both provided with
mounting holes.
FEATURES
1. Original TOA design ensures precise directivity control and
high quality sound.
2. Precisely controlled horizontal and vertical sound dispersion pattern across a frequency range of 630 to 16,000Hz.
3. High efficiency over the low frequency band.
4. Smooth frequency response.
5. 2-inch (49mm) diameter cast-aluminum throat.
6. Resonance-free, rigid construction.
7. Mouth/throat mounting holes.
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APPEARANCE AND DIMENSIONAL DIAGRAM
LE-940
LE-640
Viewed from A
LE-420
Viewed from A
Viewed from A
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CHARACTERISTIC DIAGRAMS
• Coverage Angle vs Frequency (-6dB)
• Directivity Factor vs Frequency (Q)
• Coverage Angle vs Frequency (-6dB)
• Polar Response (1/3 Octave Pink Noise)
500Hz
4kHz 8kHz
1kHz 2kHz
• Polar Response (1/3 Octave Pink Noise)
—— Horizontal
- - - -
Vertical
16kHz
— Horizontal ---- Vertical
• Directivity Factor vs Frequency (Q)
• Coverage Angle vs Frequency (-6dB)
• Directivity Factor vs Frequency (Q)
500Hz
4kHz
1kHz
8kHz
• Polar Response (1/3 Octave Pink Noise)
500Hz
1kHz
— Horizontal
2kHz
16kHz
---- Vertical
2kHz
4kHz
8kHz 16kHz
133-01-276-10
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SPECIFICATIONS
Model
Coverage Angle Horizontal
Vertical
Crossover Frequency 500Hz or more
Throat Diameter 2" (49mm)
Applicable Driver
Construction
Dimensions
Weight
Horn Bell
Horn Throat Aluminum, sand cast
Mouth Height
Mouth Width
Length 28.7" (730mm)
LE-940
90° (+ 22°,–6°) (630Hz to 20kHz)
40° (+15°,–0°) (630Hz to 20kHz)
HFD-651-8/16 (using throat adaptor)
Fiberglass reinforced plastic
28.5" (725mm)
30.7" (780mm)
28.6 Ibs (13kg)
OPTIONAL ACCESSORY
YS-651 Throat Adaptor for TOA
HFD-651-8 and HFD-651-16 Drivers
Model
Coverage Angle Horizontal
Crossover Frequency
Throat Diameter
Applicable Driver
Construction Horn Bell
Dimensions
Weight
Model
Coverage Angle Horizontal
Crossover Frequency
Throat Diameter
Applicable Driver
Construction Horn Bell
Dimensions
Weight
*Specifications are subject to change without notice.
Vertical
Horn Throat
Mouth Height
Mouth Width
Length
Vertical
Horn Throat
Mouth Height
Mouth Width
Length
LE-640
60° (+ 15° -4°) (630Hz to 16kHz)
40° (+16°
500Hz or more
2" (49mm)
HFD-651-8/16 (using throat adaptor)
Fiberglass reinforced plastic
Aluminum, sand cast
28.5" (725mm)
30.7 " (780mm)
28.7" (730mm)
26.4 Ibs (12kg)
LE-420
40° (+ 13° -1°) (630Hz to 16kHz)
20° (+ 8° -3°) (1kHz to 16kHz)
500Hz or more
2" (49mm)
HFD-651-8/16 (using throat adaptor)
Fiberglass reinforced plastic
Aluminum, sand cast
28.5" (725mm)
30.7" (780mm)
54.3" (1,378mm)
37.4 Ibs (17kg)
-2°)(630Hz to 20kHz)
Printed in Japan 833-64-815-00
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