ITU 6.1 with six discrete full-range audio channels, implemented in DVD-A, SACD, and DTS-ES Discrete, provide the means to deliver full sphere periphonic 3D surround sound. For compatible distribution, the channels are converted to plausible 5.1/6.1 reproduction, but can still be fully recovered for `PerAmbio` reproduction ` an Ambisonic + Ambiophonic hybrid approach, described in prior papers, that maximizes 3D envelopment along with front stage imaging and spaciousness, while economizing the number of channels and speakers. To clarify that fewer media channels "r" are required than speakers "s" the use of MCN - multichannel numbering, in the form "r.lfe.s" is proposed. Experimental `PerAmbio 6.1.10` (10 speakers minimum + subwoofer) recordings test three encoding variations applicable in cinema, broadcast, and music-only production.
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