Mark Levinson 31 Manual page 24

24
If the Nº31 will be subject to direct sunlight, place it no more than
10 feet from where you'll normally operate the Remote Control.
Where bright sunlight virtually floods the room, IR communication
may not be possible.
In a room lighted primarily with incandescent fixtures, place the
Nº31 no more than 25 feet from where you'll normally operate the
Remote Control. In a room with fluorescent fixtures, this range will
be reduced. Where bright fluorescent lighting virtually floods the
room, IR communication may not be possible.
IR, like visible light, reacts differently when it meets different
surfaces. Carpeting and draperies, for example, tend to diffuse
(scatter) IR and interfere with its transmission. Glossy or reflective
surfaces, such as mirrors and smooth walls, "bounce" (reflect) IR
and won't interfere with its transmission. When placing the Nº31,
it's important to account for potential IR bounce and diffusion.
Bare wall
(bounce)
(For example, in a room with thick carpeting, heavy
draperies, and many pieces of furniture, you'd place the Nº31
closer to where you'll normally operate the Remote Control
than you would in a sparsely furnished room with bare walls
and hardwood flooring.)
If possible, install the Nº31 directly opposite where you'll normally
operate the Remote Control. In practice, the Remote Control will
operate the Nº31 at up to 30 degrees to either side of this direct
line. To either side of this line, successful IR communication will
depend on bounce and ambient lighting.
Draperies
(diffusion)