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Designing a System
1
Determine the number of audio channels
You will need to order one LT-82 transmitter for each audio channel. The Listen system can deliver
up to four audio channels simultaneously.
2
Determine the room size and shape
You should either measure the room or use the architect's plans to obtain this information.
3
Complete the room layout worksheet
Complete the room layout worksheet found in the final section of this guide placing the location of the
transmitters, power supplies and radiators using the worksheet key. The following factors will determine
the coverage of the room.
3A
Horizontal Plane Footprint Pattern (feet)
50
40
30
20
10
Coverage
0
pattern shown
in feet
10
20
30
40
50
You should use the above coverage pattern to determine coverage of each radiator in your system, not by trial
and error. The radiator will be stronger when new and therefore is under-rated by 40 percent and the coverage
pattern above accounts for this. 40 percent degradation will occur after approximately 8,000 operating hours.
Number of radiators and location
Except in small rooms it is recommended that at least two radiators be used to ensure good coverage and
minimal shading. Listen Technologies radiators (when used with Listen Technologies ' LR-42 and LR-44
receivers) will cover approximately 10,000
(note the coverage decreases as the number of channels goes up). For two channels, one radiator will
ft
2
cover 5,000
(465
LR-4200-IR/LR-5200-IR receivers, the approximate line-of-sight coverage increases to 40,000
for one channel.
0
10
20
30
40
ft
2
(929
m
2
) and for four channels, one radiator will cover 2,500
4 TX
50
60
70
80
m
2
) for one channel as indicated in the diagram below
ft
2
(232
2 TX
90
100
110
120
m
2
). When using
ft
2
(3716 m2)
1 TX
130
140
150
l
7
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