I use 3 Noise Harvesters. Can't say I've heard that much difference after a power conditioner such as PPP or PurePower or even RGPC is implemented but they are nice to track how much residual noise you have by plugging them into the power conditioner itself as well as other receptacles in your listening room. They do work as witnessed by their blinking rates and absense there of and do respond to noise and supposedly eat up some of that residual noise. If the results are very audible or if youi need more than a dozen of them to really reap the benefits, I don't know, I haven't heard much difference with them in my own system.
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