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Using the Reverb Programs Lexicon, Inc. The perception of envelopment requires that the interaural time delay and level differences should be fluctuating. In a small relatively dead room the only way these differences can fluctuate is if you have at least two sound sources, and the relative phase between these sources is fluctuating. (Ideally these sound sources should be reproducing decorrelated reverberation.) The optimum direction for these two sound sources (loudspeakers) depends on frequency. Once again below 700Hz the optimum direction is from the side, and as the frequency goes up the optimum angle moves toward the medial plane – closer to the front, or closer to the rear. cies, psychologically the low frequencies are particularly important. For example, even in a dead room a standard two channel loudspeaker system (+/-30 degrees from the front) can produce envelopment if the sound source is decorrelated and contains primarily frequencies above 1000Hz – such as strings or applause. But low frequency envelopment, the life blood of lower strings and basses, is missing. Add low frequency uncorrelated reverberation to loudspeakers at the sides, and the life magically returns. (For a more thorough overview of this subject, see David Griesinger's web page at www.lexicon.com/links.) Although envelopment can be perceived at all frequen- 5-6 Home Next Page >> << Go Back
