Network expander and AC quality

This is not radiated rfi. It is directly on the AC power line.

As an addendums to my question,
1. If not filtered out, what is the sonic consequence of this added rf to the AC power? I.e, how does it affect the sound?
2. Which components would filter out this rf? Power conditioner? or power supply inside streamer, cd player, preamp, amp, etc?

MC,

Thanks for your take on RFI, and your suggestions on personal comparisons.

I have done a decent amount of experimenting and tweaking with power cables, interconnects, power conditioners, room effects - even fuses, but to a lesser degree. So I know that everything matters. I belong to an audio society that meets monthly at different local high end dealers. So (before Covid) I got to hear many components and tweaks there, (including SR equipment). I try things out at home as well, always trying to balance expenditures and SQ. 
I have two good quality systems in separate rooms. Both systems are better than they have ever been, and it’s taken years to get to this level. The less expensive one sounds slightly better, but I believe that it’s due to the room acoustics, and listening position, not the equipment so much.

I actually enjoy listening to music more than ever, but the upgrade urge never quits. Strange hobby.

One more little tidbit: recently enrolled in three virtual Zoom music courses - Russian Classical Composers, Rock & Roll of the 60s, and The Blues.

Regards