IMHO: PS Audio P500 is the best way to go, if you can afford it. It gives a steady 60hz sine wave, isolation, surge protection and doesn't limit current like lots of other filters. You can't get better power than a pure 60hz sine wave. I use two P500's. Together they cost more than my integrated amp, but they're worth it. I could have purchased one P1000, but two P500's allow me more outlets, better isolation, better cooling, and more flexibility. They make a HUGE improvement in sound quality. BTW: I have no affiliation with PS Audio, and nothing to sell you.
Best wishes,
Jay
Best wishes,
Jay