Yamaha YRS-2100 Mode D'emploi page 10

Installation
Installing this unit
This unit outputs sound beam as shown in the illustrations below. Install this unit where there are no obstacles such as furniture
obstructing the path of sound beams. Otherwise, the desired surround sound effects may not be achieved.
You may install this unit in parallel with the wall or in the corner.
Parallel installation
Install this unit in the exact center of the wall when it is measured
from the left and right corners
An object, such as furniture
■ Installation examples
Parallel installation
Install this unit as close to the exact center of the wall as possible.
Ideal installation condition
Install this unit as close to the exact front of your normal listening position as possible.
The distance between listening position and the unit should be more than 1.8 m (6 ft).
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En
Corner installation
Install this unit in the corner at a 40° to 50° angle from the
adjacent walls.
Parallel installation
(with 5Beam)
Corner installation
(with Stereo+3Beam)
40° to 50°