This paper focuses on a stereophonic play back system designed to adjust the ``sweet spot` to the listener`s position. The system includes an optical face tracker which provides information about the listener`s x-y position. Accordingly, the loudspeaker signals are manipulated in real-time in order to move the ``sweet spot`. The stereophonic perception with an adjusted ``sweet spot` is theoretically investigated on the basis of several models of binaural hearing. The results indicate that an adjustment of signals corresponding to the center of the listener`s head does improve the localization over the whole listening area. Although some localization error remains due to asymmetric signal paths for off-center listening positions, which can be estimated and compensated for.
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