looking for the filter power supply or receptacle

Months ago, I saw a filter power supply in a shop. The salesman told me that it's a filter power supply, actually I don't know what it is. It just like a common electrical outlet or a receptacle. But the sound seems different when the amplifier connect to it. Is anybody know this power supply?

I suspect that if you read this thread (from about post #10) http://audiomastersforum.net/amforum/index.php/topic,4856.0.html it might be a little enlightening 

Filtering of the mains supply in most cases is useless. In no case does it improve "sound quality". Under rare circumstnces, when controlled rectifiers or dimmers cause audible interference in the sound equipment, it makes sense to use a filter between the wall outlet and the computer or other equipment. Such filters are commercially available. An easy way to make one yourself is to use a filter such as is to be found in a wrecked washing machine.

Filtering of the mains supply in most cases is useless. In no case does it improve "sound quality". Under rare circumstnces, when controlled rectifiers or dimmers cause audible interference in the sound equipment, it makes sense to use a filter between the wall outlet and the computer or other equipment. Such filters are commercially available. An easy way to make one yourself is to use a filter such as is to be found in a wrecked washing machine.

But someone seems to make these mains supply professionally - PS Audiohttp://www.psaudio.com/ps/products/list/category/power/, Yakarshttp://www.yakars.com/
I should learn more about it.

I should learn more about it.

Absolutely everything you need to know is either in this thread, or the one it refers to. As far as 'improving the sound' goes, it's a complete con designed to part you from your money by breeding insecurity about what you think you might be missing.

"Only the Noise Harvester removes line noise and converts it to another form of energy, light! "

"Enhance the stereoscopic effect of music"
etc., etc.

What utter nonsense!!! 

Does the term 'snake oil' mean anything to you?

Loved reading that thread back after a depressing week at work. Anyone got something new to add?

Loved reading that thread back after a depressing week at work. Anyone got something new to add?

Oh yes ! It remembers me to some people selling filters to separate "atomic generated power" from "green power" at the power outlet of your home.