One of the first things I recommend people doing when getting a new computer is to play around with the audio enhancements, and try turning them off either via the "Disable audio enhancements" option in Sounds or simply bypassing them with custom drivers. I think a large reason why onboard audio is attacked so often isn't because of interference, but with how the drivers intentionally mess up the sound. When I bought my mobile for my build, everything sounded terrible. And a quick frequency sweep showed everything was so v shaped, EQed far beyond the point of clipping.
Uninstalled the stock realtek driver, installed cousin drivers with Dolby Headphones (I wanna play games.
). Magic. Sounds just as good as my dedicated DAC. Hell, the noise floor is even quieter than my outboard DAC. XD
Didn't know that windows 10 automatically updated everything, so my new computer automatically installed the realtek drivers back, so one say I woke up and OMG MY EARS!!!!!
But yeah, if you can't remove the drivers, even a cheap external DAC will do the trick to bypass them.