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Highly recommend the Blue Circle BC86 Noise Hound. Two are better than one ($110 each).
I believe the Seakay Line Rover is a parallel line conditioner. I've used one for years and find it makes a slight, but positive, difference. I am convinced it protected the electrical systems in my house a few years back when there was a lightning strike right across the street from my house; every house in a one block radius was affected except ours. Now I don't care if it works at cleaning up the AC or not.