optical isolation/psu?

[the_doc735]

I have read on here that LPSU's don't matter BEFORE an optical isolation section in a Hi-Fi chain, BUT ~ (wall wart) smps emit high level impedance noise 'backwash' into the AC mains! So, that means that even though the forward section is not affected due to the optical (data only) isolation, ultimately the backward effect of high impedance STILL impairs the overall Hi-Fi sound quality?

 

Surely, that is reason enough to employ LPSU throughout the chain?

 

RULES OF THE THREAD:

 

Please only reply to this question individually, no conferring! Thank you for this observation!