The apparent position of speech and music sound sources was investigated using both a two channel loudspeaker array and a three channel loudspeaker array. The results showed that a sine-cosine pan law was reasonably accurate for the three channel array, but consistently produced inmages that were wider than expected with a two channel array. The discrepancy was investigated using a headphone nmodel. We found the apparent position depends strongly on the spectrum of the source, with speech frequencies tending to dominate the overall impression.
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