Got my Entech yesterday and it seems to me that this device can only be helpful in communicating your overall home line noise.
I was happy when first testing a non-audio circuit that resulted in minimal noise. That convinced me that previous efforts to clean my power might have been beneficial. I then plugged in the Entech to a get it anywhere power strip in the same circuit and the noise was reduced by 75%. Great!! Now it's time to figure out all the negative affects any power purifying device contributes.
LP