From what I understand, Surround AI is a 'dynamic' DSP in that it's characteristics can change on the fly depending on what the source audio is doing. Pretty cool tech, but adds random reverb/echo that pollutes the original mix too much for my tastes. I agree with snakeeyes that Dolby Surround/NeuralX upmixers are good enough (until Auro is available which some people say sounds better).