John Pharo at The Cable Company sent me a Noise Sniffer from their library so I could see if my Noise Destroyer is working since I didn't notice any improvement anywhere on TV or stereo.
Very interesting! In my stereo room I have four outlets on the same circuit, with the Noise Destroyer in the third and the system in the fourth (last). Using the Noise Sniffer I found that it cleaned up the most noise, not in the third outlet closest to the system, or even the second outlet. It cleaned up the most noise when it was in the first outlet.
And for some reason, neither the floor lamp, ceiling light nor the ceiling fan added any noticeable noise, even though they're on the same circuit, unless the ceiling light and fan are before the first outlet.
Chuck