Listen Technologies Stationary LA-350 - Manual (Page 15)

9
Design Guide Design Guide Design Guide
Designing a System
You will need to order one LT-82 transmitter for each audio channel. The Listen system can deliver up to four
audio channels simultaneously.
1
Determine the number of audio channels
2
Determine the room size and shape
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transmitters, power supplies and radiators using the worksheet key. The following factors will determine the
coverage of the room.
3
Complete the room layout worksheet
3A
Except in small rooms it is recommended that at least two radiators be used to ensure good coverage and
minimal shading. Listen radiators (when used with Listen receivers) will cover approximately 10,000
ft 2
(929 m 2 ) for one channel as indicated in the diagram below (note the coverage decreases as the number
of channels goes up). For two channels, one radiator will cover 5,000 ft 2 (465 m 2 ) and for four channels, one
radiator will cover 2,500 ft 2 (232 m 2 ).
Number of radiators and location
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.
10
10
0
0
30
20
50
40
40
50
20
30
10
20 30 40 50 60 70 80 90 100 110 120 130 140 150
1 TX 2 TX 4 TX
Horizontal Plane Footprint Pattern (feet)
Coverage pattern
shown in feet