@dekay Furman has an excellent track record with post outlet line conditioning. Their conditioners are used in hospitals, music halls, studios, and laboratories because of their effectiveness in identifying and neutralizing interference.
My house was rewired to the highest spec before I moved in, and the Furman gives me dead silent power. I chose all my audio components to have inaudible levels of noise. Anyone who has a line noise problem or current instability would best spend their money on wiring and an inexpensive Furman unit. Good wiring has other benefits, including safety and uninterrupted delivery. After carefully determining that none of your components is at fault, consult an electrician to determine the source and extent of the problem.
The only problem I ever had with hum or static was when I added a French headphone amp to my system. The unit was not properly modified to reject 60hz RFI, coming from Europe where current is 50hz, so it was picking up RFI from my dimmable fluorescent bulbs. When I turned them off, the hum diminished to a much lower level - instant-on bulbs have a low standby current. Having determined the culprit, I returned it, and the system returned to silence.
Fortunately, my audio dealer is a "let's solve your problem" not an "I can sell you something expensive to fix your problem" sort.