The currently standard multichannel 5.1 and 7.1 surround sound formats are only partly capable of displaying a true 3-D sound experience. Even advanced schemes, such as ambisonics or virtual surround panning, rely on a more or less restricted listening area. In this paper these solutions are reviewed and their drawbacks are explained. Proposals for future directions are also given. A prototype of a compact, cascadable loudspeaker line array, suitable for wave-field synthesis in studios and at home, is described.
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