Posts: 300
Threads: 10
Joined: 2015 Feb
Thanks: 188
Given 143 thank(s) in 95 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: 1,201
Threads: 28
Joined: 2015 Jan
Thanks: 821
Given 371 thank(s) in 240 post(s)
Is it possible for you to try a location change?
Posts: 719
Threads: 51
Joined: 2021 Jul
Thanks: 599
Given 613 thank(s) in 287 post(s)
Country:
Do you get the same thing without the UPS?
Posts: 779
Threads: 36
Joined: 2018 Feb
Thanks: 670
Given 1116 thank(s) in 418 post(s)
Country:
Saw you tried different cap cards, did you try another set of other cables too?