We have proposed a new 3D sound reproduction system that consists of two side loudspeaker matrices each with four loudspeakers. The 3D sound images that applied to this system were created by the amplitude panning method and convolution of head-related transfer function (HRTF). In our past research we used the loudspeaker matrices arranged as a square shape, nevertheless the accuracy of sound image localization should be improved. We changed the shape of loudspeaker matrices from a square to a diamond by rotating 45 degrees to improve direction perception. As a result, we could be closer the localized sound images to intended directions than the square-shaped loudspeaker matrices by implementing the diamond-shaped loudspeaker matrices.
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