I'd talk to Furman about this.
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I would ask you to consider another option. Rather than "filtering" the incoming power to your system, how about regenerating a new sinewave with THD from the power company virtually eliminated? Since PS Audio recently came out with a new line of regenerators there should be some P5s or P10s out in the pre-owned market. I run my entire system, save for my powered subwoofers, off of one P5 Power Plant and am only using 34% of its capability. The incoming sine wave from the power company has 1.7% THD. After regeneration, there is barely .1% THD. Purer, cleaner music with natural dynamic swing. Full Stop.
The parts don't age, so much as surges age them, but this aging applies only to disposable units, which incorporate shunt devices like MOV's to short lightning strikes to ground, or neutral.
Furman conditioners which incorporate SMP can last decades, and protect your equipment from aging as quickly. It would take a pretty spectacular set of strikes to age them.
Thanks for all the input, it is very helpful. To Elizabeth's last point, the usefulness of a "power conditione" includes both functions, typically. Frankly, it the surge protection is kaput after a period of time, then one is left with only power conditioner and no protection for their gear in the event of a voltage surge. I think both functions are equally important.
Question: is there a way to discover if the surge protection is still effective in a unit?