Having read the first 9 pages of this thread - which I would sum up as
"I have selected a few facts and now believe I fully understand all audio and electronic phenomena and anyone who questions the finality of my conclusions must be delusional"*- so this seems like one of the worst threads on the site so I thought it'd be a good idea for me throw out my 2 cents. Which probably has already been said somewhere in these pages already.
(1.) If it sounds better, then delusion or not I'm fer it
(2.) if it sounds like blowhards pissing then I'm agin it
(3.) I bought an Eitr and it sounds WAY better than without or via my optical input from my MBP
The fact is, I don't know what's in that Eitr box. Could be well designed electronics doing good ear stuff or it could be a box of delusions or it could be
machine elves. It really doesn't matter to me because it works and there is science to explain why that is, it's just that either nobody here or no humans know what it is.
Some engineers at Cisco who design audio gear think USB cables make a difference because they scienced it out. There are also a few Google engineers (from both legacy tanberg and android) who say the same thing for the same reasons and have posted stuff somewhere. Could be the bathroom for all I know - they post a lot of sciencey stuff above the urinals.
Anyway, it's something about chip sets and noise backing the chips up and the audio protocol doesn't ask for missed bits so filters have to fill in gaps and this causes audio quality degradation blah blah blah.
The Eitr is a pretty sweet product that can help listening be better, is my point.