3
Diffuse Sound
In a movie theater, a diffuse surround sound
field is created by using an array of surround
speakers around the sides and rear of the
theater. Since this is not practical in the home,
a diffuse-field speaker achieves the same effect
with a single pair of speakers.
When a conventional direct-radiating speaker
is used for surround, sound is aimed directly at
the listener. Because the listener can localize
the sound, the surround effect is spoiled (above
right).
The VRS Pro contains a pair of high-frequency
drivers, operating with opposite polarities—
one speaker pushes out and the other pulls in.
This directs most of the sound sideways (right).
The VRS Pro generates a “figure 8” pattern
above 350Hz, along the walls of the room. The
sound is then reflected from the end walls, ceil-
ing and floor before returning to the listener as
diffuse sound, which comes from all around the
listener.