Listen Technologies Stationary LA-350 - Manual (Page 17)

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Design Guide Design Guide Design Guide
Designing a System
In this example a total of four radiators, one in each corner, ensures good coverage at all locations and orientations.
Except in small rooms, it is recommended that at least two radiators are used to prevent shading of the IR signal.
It is a good idea to provide over-lapping coverage (like in a sprinkling system) of the signal whenever possible to ensure that
the signal does not have drop outs. In addition, you should provide special radiator coverage for shaded areas such as under
a balcony or in the front of a room where the front mounted radiators do not provide enough coverage.
The following diagrams illustrate these concepts.