TX3
25
°
25
°
250 ft.
130
ft.
Fig. 4: Infrared Illumination Pattern
Top Perspective
Using Two Transmitters For Greater Coverage Area
Fig. 5: Maximizing Coverage
Figures 4, 5, and 6 illustrate infrared light patterns
and recommended transmitter locations. In listening
areas up to 10,000 square feet, the TX3 transmitter
panel should be installed on the left or right side of
the front wall of the listening area It needs to be
above the audience to permit a direct line of sight
between the transmitter and people wearing receivers
when the people are standing or sitting.
It’s helpful to think of the IR transmitter as an
invisible floodlight. You want to aim it so listeners
are “flooded” with infrared light.
Many listening areas will require two IR transmitters
for complete coverage. Place one transmitter panel
on the left side of the front wall and the other on the
right hand side. The two transmitters will be
connected together with a coaxial cable.
The infrared illumination pattern from a single
transmitter is a cone-shaped beam, with a 50° angle.
The horizontal and vertical patterns are identical.
Figures 4 and 5 show examples of coverage patterns.
These patterns are the direct radiation pattern. The
infrared radiation does not drop to zero outside the
illustrated patterns; it decreases. It still may be
useable at a greater distance, depending on receiver
sensitivity and reflection characteristics of the room.
Infrared light reflects off light-colored surfaces and
scatters, which increases the coverage area. Dark
colored surfaces tend to absorb infrared light,
minimizing reflections, and limiting coverage to the
direct illumination pattern. It’s O.K. (and desirable)
for the illumination patterns to overlap when
120'
SCREEN
30'
STAGE
6'
Center
Of Emitter
Beam
Fig. 6: Side Perspective
Williams Sound
®
Helping People Hear
7
