Posts: 284
Threads: 9
Joined: 2015 Feb
Thanks: 179
Given 130 thank(s) in 86 post(s)
Country:
Have you ruled out ground loops? I had to make sure both my capture PC and the playback device weren't powered by a grounded power cable in order to elminate ground hum.
Posts: 1,161
Threads: 28
Joined: 2015 Jan
Thanks: 771
Given 353 thank(s) in 229 post(s)
Is it possible for you to try a location change?
Posts: 660
Threads: 50
Joined: 2021 Jul
Thanks: 533
Given 577 thank(s) in 271 post(s)
Country:
Do you get the same thing without the UPS?
Posts: 767
Threads: 35
Joined: 2018 Feb
Thanks: 657
Given 1095 thank(s) in 413 post(s)
Country:
Saw you tried different cap cards, did you try another set of other cables too?