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Surround
loudspeakers are always used in multiples, normally 8 or 12 per surround
channel. If we consider 6 meters as the average distance from a typical
listener to all of the surround loudspeakers, the effect of 8 surrounds would
increase the overall level by 9 dB, giving an average peak level in the house
of 104 dB. The use of 12 surrounds would produce a peak level, per surround
channel, of 106 dB. Normally the reason for specifying 12 over 8 surrounds is
not for the sake of more level, but for better diffusion of the surround
effect.
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