Hello Sir
Thanks a lot for the answer
I have tested the isolation rj45 switch , which works rather well
As you quoted , loads of people are satisfied with the FYI , but that tends to be difficult to arrange
Some subjective testing have been done and described in France
In the end , loads of people are using the "medical" switch
Regarding my system with the U1 + Melco , I should say that the difference is minimal with the purifying switch (placebo ?) , and may be this is because both the U1 and the Melco are well isolated (and the melco is connected directly to the U1)
Thanks again , and always a pleasure to see to quick answers .. and thanks again for the U1 which is really good (oups I'm off topic)
Cheers