Posts: 285
Threads: 9
Joined: 2015 Feb
Thanks: 173
Given 129 thank(s) in 85 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: 1,137
Threads: 28
Joined: 2015 Jan
Thanks: 734
Given 336 thank(s) in 219 post(s)
Is it possible for you to try a location change?
Posts: 635
Threads: 47
Joined: 2021 Jul
Thanks: 495
Given 517 thank(s) in 255 post(s)
Country:
Do you get the same thing without the UPS?
Posts: 767
Threads: 35
Joined: 2018 Feb
Thanks: 655
Given 1092 thank(s) in 412 post(s)
Country:
Saw you tried different cap cards, did you try another set of other cables too?