Not sure if this helps, but when I bought my Wavelength Proton 4 years ago. Last weekend I did an A/B comparison to the $2800 Ayre QB9. The Ayre was better, but not by $2200. We when bought the Proton, we compared it to the Cambridge and the Proton was a no brainer. I'm probably going to upgrade soon to the W4SDac2se. You might check out the new Protons for $600 or let me know if you why to know more about mine.
Good luck.
Glen
Good luck.
Glen