Toa LE-420 User manual

TOA SPEAKER SYSTEM
UNIFORM DIRECTIVITY HORNS
LE-940/LE-640/LE-420
DESCRIPTION
FEATURES
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 sur-
face, 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 adap-
tor. 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.
1. Original TOA design ensures precise directivity control and
high quality sound.
2. Precisely controlled horizontal and vertical sound disper-
sion 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.

APPEARANCE AND DIMENSIONAL DIAGRAM
LE-940
Viewed from A
LE-640
Viewed from A
LE-420
Viewed from A

CHARACTERISTIC DIAGRAMS
• Coverage Angle vs Frequency (-6dB)
• Polar Response (1/3 Octave Pink Noise) ——Horizontal - - - - Vertical
• Directivity Factor vs Frequency (Q) 500Hz
1kHz 2kHz
4kHz 8kHz 16kHz
• Coverage Angle vs Frequency (-6dB)
• Directivity Factor vs Frequency (Q)
• Polar Response (1/3 Octave Pink Noise) — Horizontal ---- Vertical
500Hz 1kHz 2kHz
4kHz 8kHz 16kHz
• Coverage Angle vs Frequency (-6dB) • Polar Response (1/3 Octave Pink Noise)
— Horizontal ---- Vertical
• Directivity Factor vs Frequency (Q)
500Hz
1kHz 2kHz
4kHz 8kHz 16kHz
133-01-276-10

SPECIFICATIONS
Model LE-940
Coverage Angle Horizontal 90° (+ 22°,–6°) (630Hz to 20kHz)
Vertical 40° (+15°,–0°) (630Hz to 20kHz)
Crossover Frequency 500Hz or more
Throat Diameter 2" (49mm)
Applicable Driver
HFD-651-8/16 (using throat adaptor)
Construction Horn Bell Fiberglassreinforcedplastic
Horn Throat Aluminum, sand cast
Dimensions Mouth Height 28.5" (725mm)
Mouth Width 30.7" (780mm)
Length 28.7" (730mm)
Weight
28.6Ibs(13kg)
Model
Coverage Angle Horizontal
Vertical
Crossover Frequency
Throat Diameter
Applicable Driver
Construction Horn Bell
Horn Throat
Dimensions
Mouth Height
Mouth Width
Length
Weight
LE-640
60° (+ 15° -4°) (630Hz to 16kHz)
40° (+16° -2°)(630Hz to 20kHz)
500Hz or more
2" (49mm)
HFD-651-8/16 (using throat adaptor)
Fiberglassreinforcedplastic
Aluminum, sand cast
28.5" (725mm)
30.7"(780mm)
28.7" (730mm)
26.4 Ibs (12kg)
Model
Coverage Angle Horizontal
Vertical
Crossover Frequency
Throat Diameter
Applicable Driver
Construction Horn Bell
Horn Throat
Dimensions
Mouth Height
Mouth Width
Length
Weight
*Specifications are subject to change without notice.
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)
Fiberglassreinforcedplastic
Aluminum, sand cast
28.5" (725mm)
30.7" (780mm)
54.3"(1,378mm)
37.4Ibs(17kg)
OPTIONAL ACCESSORY
YS-651 Throat Adaptor for TOA
HFD-651-8 and HFD-651-16 Drivers
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