Quadraphonic sound, or 4.0 surround sound, utilizes four audio channels connected to four speakers positioned at the corners of a listening space. The multi-tracked audio is mixed dimensional, immersing the listener in an expansive soundscape. Quadio is a Blu-ray with 192/24 resolution Quadraphonic and Hi-Res Stereo mixes transferred from the original half-inch four-channel masters.

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