DD was a trade-off for channels vs quality. I think people see 'Dolby' and go 'Awesome! This will improve my sound!'. But if you do these enhancements through another program (and there are many out there) you can apply these on the uncompressed PCM source and it will sound even better than these same enhancements on a compressed source like you have now. If it 'sounds' better, it's not the DD encoding - it's the other filters you're applying, like the EQ or any 'enhancements'. 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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