It is important to understandthat just as the propagationof sound outdoors is effected by its surroundingsso is the propagationof sound indoors. Some of these environmental factors exist in both cases, such as reflective surfaces and absorbant materials, but there are a few unique effects that may need to be considered. The factors described on this Daae can cause the behavior of an outdoor installa- tion to deviate from tjhe Inverse Square Law. Remember not all frequencies of the propagated sound will be affected uniformly.
JUNGLE
lHumidity - Because water vapor is lighter than air, humid is less dense than dry air and, therefore absorbs less acoustical energy than dry air particularly at frequencies above 2kHz. To labour the point, a speaker mounted on a tree in a jungle will project high frequency sound further than the same speaker mounted on a cactus in the desert (see diags. 5 & 6).
Paintingthe Speakers -
The polystyrene speaker enclosures of the Controls23, Control@25, & Control@28 can be painted to match almost any decor. The vinyl skin of the Controls
lRemove the grilles. Mask the woofers, tweeters, & ports on the front, and the wire terminals on the back, being careful that no tape comes in direct contact with the drivers.
lClean the enclosures with a light solvent such as mineral spirits by rubbing the components with a lightly dampened cloth. Do not, however, use abrasives such as sandpaper or steel wool on the enclosures. Nor should you use gasoline kerosene, acetone, MEK, paint thinner, harsh detergents o other chemicals. Use of these cleaners may result in perm nent damage to the enclosures.
After cleaning, apply two or more thin coats of either latex or
The grilles require maskingof the logo plug, then spray painting. If the grill is rolled or brush painted, the mesh may become clogged with paint, and poor sound quality may result.
lThe InvisiBalFMmount may also be painted, but because it
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