jay73
The Greenwave meter starts at 3,000 hz , since we want clean power at 60 hz it's missing a lot of interference .
I have 7 Green wave filters on the circuit that my stereo is plugged into but they only filter higher frequency interference , I also use 3 PS Audio Noise Harvesters on this circuit . When I had 5 Noise Harvesters and 2 Greenwave filters the NHs would be blinking very rapidly when the heat pump was on but now with less NHs and more GF they blink every couple of seconds . I placed on NH in the computer outlet and another with the fridge along with a GF . I don't use any other filters other than everything in my house is plugged into a Tripp-Lite Ultra isobar .