Niles OS7.5 Installation & Operation Manual page 10

When using more than one pair, it is usually best to alternate a left channel and
then a right channel, so that you have the best possible stereo coverage possible.
The position of the loudspeakers and their surroundings play a very important role
in how a stereo image is created. You should experiment to find the very best
position for your loudspeakers. Here are some guidelines to make the process
quick and easy.
Figure 4
Illustration depicts the optimum
placement zone for a listening
distance of ten feet.
Make sure you are not blocking or reflecting the sound off of furniture or other
objects. You should have a direct line of sight with the front of the loudspeaker. To
determine the best position, measure the distance between the ideal listening
position and the wall you plan to mount the loudspeakers on. Try to place the
loudspeakers so that they are at least one-half the listening distance apart (this
maintains a large, pleasant stereo "image") and less than the entire listening
distance (this avoids a "hole-in-the-middle" effect). For example; if you are ten feet
back from the wall, the loudspeakers should be between five and ten feet apart (See
Figure 4).
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