| Re: 5.1 vs 7.1 surround Newbie question
Many AVRs in the mid to high end range will allow a digital S/PDIF (coax or optical Toslink) 5.1 chan DD or dts bitstream input or a HDMI 5.1 multichannel Linear PCM input to be converted to drive a 7.1 speaker set by allowing Dolby Pro Logic IIx to be applied. It recovers the back surround signals from the side surrounds by using matrix decoding. The lower end Onkyo (6xx series) and Panasonic AVRs don't allow PLIIx to be used this way but higher end Onkyo models (805, etc) do, as do most Yamaha and Denon AVRs.
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