I live in a neighborhood which is about 35 years old, when new, the code allowed for the cabling from the power company to be installed under ground, without conduit. At about 28 years we had (seemingly) frequent power outages. I have a long-time friend whose husband is now a VP for a large construction firm, formerly a 1st class electrician. Before a major kitchen renovation four years ago, he came out and wired a nice whole house surge protector into our main panel (about $1200 at his price), and until our underground wiring was replaced (about 18 months ago), it would log as many as 122 surges in a month! Since the feeder lines were replaced (in conduit this time), we have seen only 2 surges in 18 months!
For my first audio system upgrade I added a Furman power conditioner behind an APC 1500 volt/amp UPS. I presume the power conditioner would take care of any “dirty” power created by the APC unit?