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3D positioning technology is based on Matsushita Electric Industrial's proprietary digital signal processing technology, PERSONAL SURROUND TECHNOLOGY™*1, optimized for two speakers. This technology enables of the realization of three-dimensional sound (front/back, left/right, and up/down) using two normal speakers or headphones. Differences in sound volume and timing between left and right directions, as well as different sound frequencies in the front/back or up/down directions, allow listeners to enjoy superior 3D sound realism.