Well, there is/was SACD. I don't know much about it. It remains a niche market; whether sustaining or dying, I couldn't say. https://en.wikipedia.org/wiki/Su

Well, there is/was SACD. I don't know much about it. It remains a niche market; whether sustaining or dying, I couldn't say. https://en.wikipedia.org/wiki/Super_Audio_CD https://en.wikipedia.org/wiki/Super_Audio_CD Interesting to think about it in comparison with Blu-Ray, which has also had issues around uptake. P.S. And https://en.wikipedia.org/wiki/DVD-Audio https://en.wikipedia.org/wiki/DVD-Audio , I see.