Let alone playing movies or music files that are 24-bit 48/96Khz, where you are throwing away even more information. There's no need to use DD over HDMI - you're literally going backwards and throwing away sound data that you don't have to.Įven when you're using 16-bit 48Khz sources - which most games are, you're still generating worse sound by lossy compressing it instead of transporting it uncompressed over HDMI. HDMI can can transport 8 channels uncompressed at 24-bit 96Khz, this is one of the key reasons HDMI was developed.
Without this, SPDIF only has the bandwidth to transport 2 channels uncompressed. One of DD's main advantages was transporting 5.1 channel sound over SPDIF by lossy compression. It has worse sound quality than 24-bit 48/96Khz PCM and even worse sound quality than lossy compression of 24-bit 48/96Khz sources.
Janos kind of covered it but just to be clear - DD is 16-bit 48Khz lossy compression.
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