Andy Van Till has a detailed guide about enabling multi-channel audio for SPDIF and HDMI connections. The guide explains terms, options and how to configure the outputs. I have found getting the audio out in the right format can be one of the most challenging aspects of settings up a HTPC so if your digital audio with a HTPC then its well worth reading.
If you’re fortunate enough to have a PC with multi-channel LPCM output enabling full fidelity audio output is easy (and there’s not much point in reading the rest of this) but for those using a SPDIF or stereo only HDMI connection getting multi-channel audio working can be challenging. This guide intends to explain two different options and how to configure each to attain this goal.
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