Robert Schmitz-Niehaus recommends that audiophile music lovers deal with this matter at the end of his very detailed 14-page test.

Quote: “… The use of the vortex filter brought me forward in terms of sound. There is absolutely no question about that. In total, the effect achieved is greater than what I have achieved in the past by replacing some conventional products...

... If scientific luminaries are currently unable to define complex and extremely complicated listening processes down to the last detail and remain gray areas when it comes to explanations, then I don't have to be able to explain it either. My practiced hearing can, however, have differences in sound, and especially when they are as big as the Vortex filtersrecognize beyond doubt. And this innovative technology brings me forward. I strongly recommend audiophile music lovers to study this matter. "

Read the whole test here (click picture).