Avalon Acoustics OPUS Ceramique Loudspeaker - Manual (Page 26)

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Avoiding Early Reflections
The speed of sound is approximately one foot (30 cm) per millisecond. Therefore, to preserve
the natural soundstage on your recordings, there should be no reflected sounds arriving at the
listening position with a path length less than ten feet (3 meters) longer than the direct path
from speaker to listener (see Figure 8.1). This means that if the speaker or listener is placed
closer than about 5 feet to a wall or other surface, that surface should be covered with
sonically absorbent material.
Reflected Sound
Direct Sound
Figure 8.1 - The reflected sound must travel further than the direct sound, and
therefore reaches the listener at a later time.