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If something is recorded in a 5.1 format, then to ouput in 7.2 it has to be "virtualy streched" (let's go with that). Nothing I know of - there maybe loads of stuff, I just don't know - is recorded in that 7.2 format. There are standarts of recording and compressing the audio signal, and the gold standard today is 5.1.
What sub do you have exactly?
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