Audiophool A/C Filter?

[Lonely Raven]

It's almost a silly question, but what's the chances of this being snake oil, and probably just a couple caps and resistors in a wall wart?

http://www.partsconnexion.com/catalog/ac_products.html

http://www.ultrasystem.com/usfeaturedpr ... royer.html

http://www.enjoythemusic.com/magazine/e ... troyer.htm

I have a bunch of noise on the line in my "new" house, and it's painfull when I play guitar. If I play quietly, I hear more noise than guitar. I'm afraid to think of what it will be like when I finally get my Home Theater setup and I'm running 100 watts through 7 channels....

I don't want to get my hopes up, simply because my problem is so bad here...and I'm honestly not sure how to resolve it.