Toa LE-940, LE-640, LE-420 Instruction Manual

PROFESSIONAL SOUND SYSTEM

Instruction Manual

Constant Directivity Horn

GENERAL DESCRIPTION

Employing Toa's unique technology, the LE series constant
directivity horns can meet even professional's stringent
standards that always require precise directivity control,
high efficiency and high quality sounds. Their ideal ap­plications include theaters, concert halls, auditoriums, chur­ches, and movie houses.

Different formulas are used to optimize the horizontal and

vertical side wall contours. Also, both side walls are so

arranged that a mouth is an equiphase surface, permitting
a sound wave to leave the horn open end at the same in­stant.

These combine together to make the geometry ideal for

maintaining uniform directivity over the rated frequency
range and high efficiency especially in the low frequency
range.

Each horn is intended for use in systems with crossover at
500Hz or higher, and ensures uniform frequency response
over the full frequency range from 630Hz to 16kHz at any

point within the rated coverage angle. The horns have a
controlled coverage angle of 90 degrees horizontally by 40
degrees vertically (LE-940), 60°x40° (LE-640), or 40°x20°
(LE-420).

Model LE-940

LE-640
LE-420

Each horn comes w it h a cast-aluminum throat with dia­meter of 2in (49mm) for mating with Toa HFD-651-8 or

HFD-651-16 high-frequency compression driver through
the YS-651 throat adaptor (optional). The horn bell is con­structed of fiberglass reinforced plastic. The horn bell and
throat, both having s uf fi cie nt thickness, suppress reso­nance.

FEATURES

1. Toa's unique horn design.

2. Excellently controlled horizontal and vertical dispersion
over the frequency range of 630Hz to 16kHz.

3. High efficiency and smooth frequency response.

4. 2in (49mm) throat diameter.

5. Resonance-free, rigid construction.

6. Mounting holes.

SPECIFICATIONS

Model

Horizontal Coverage

Angle

Vertical Coverage

Angle

Recommended Crossover
Frequency

Throat Diameter

Applicable Driver
Construction

Dimensions
(HxWxD)

Weight
Accessories

*Specifications are subject to change without notice.

Horn Bell
Horn Throat

90° (+22°, –6°)

(630 ~ 20kHz)

40° (+15°, –0°)

(630 ~ 20kHz)

725 x780x 730mm

28.54"x30.71"x28.74"

13kg (28.7 Ibs)

LE-940

LE-640

60° ( +

15°, –4°)

(630 ~ 16kHz)

40° (+16°, –2°)

(630 ~ 20kHz)

500Hz or more
49mm (1.93")

HFD-651-8 (16), using throat adapter YS-651
Fibergrass reinforced plastic (FRP)
Cast-Aluminum

725 x 780 x 730mm

28.54"x30.71"x28.74"

12kg (26.5 Ibs)

Hexagonal bolts M8x40···6, Hexagonal nuts M8···6
Flat washers 8 d i a .···12, Spring washers 8 dia.···6

Toa Electric C o, Ltd .

KOBE, JAPAN

LE-420

40° ( +

13°, –1°)

(630 ~ 16kHz)

20°

(+8°, –3°)

(1k ~ 16kHz)

725x780x1, 378mm

28.54"x30.71"x54.25"

17kg (37.5 Ibs)

[LE-940]

Dimensions

Coverage Angle vs Frequency (–6dB)

Polar Response (1/3 Octave Pink Noise)

Horizontal

Directivity Factor vs Frequency (Q)

Vertical

500Hz 1kHz 2kHz

4kHz 8kHz 16kHz