This topic is very, very interesting to me as well. I have determined to change from 2 channel stereo to multichannel music and have been researching upmixers in deep detail.
I of course had to consider Atmos, but am not terribly interested in height channels (or video), the lossy transmission of Atmos from the streaming providers, and I have to be able to listen to the conductors/symphonies, performances I prefer.
My research lead me to think that Gerzon's approach is the best. I read his patents and derived the equations to consider implementing it in software, while watching the used market for Meridian processors.
I have almost written emails to Lyngdorf and Trinnov hoping to glean at least a bit about their philosophy/approach. If it is simply DSU or Auro I am not sure I would be enthusiastic. If I was more confident in their approach I might bite the bullet.
Thankfully, I am benefiting from the wonderful generosity of member
Croft's ad who offered some older Meridian equipment gratis in the classifieds, so have his 568.2mm waiting for me at home. My first Meridian product since my 602 and 606 in the early 90s.
Bill
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