Noise Filter Device

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got one of these on my pc atm and it does its job but from time to time, I have to move it around a bit to get it to work again. recently been thinking about buying another to put onto the one I have already, would that make it better/worse or just be pointless?

also found something on ebay called a ferrit core noise filter, that clips onto a wire and is supposed to have the same effect as the noise filter device. has anyone used one of these before and would it be a good idea to attach one to the noise filter device I already have?

 

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The one you have might have a ferrite core inside around the cable. I would imagine that's what the cheap ones consist of. Slightly more expensive ones will likely involve electronics, such as the Behringer hum destroyer HD400.

just opened the one I have, there was some circuitry inside afterall. just bought the behringer you suggested, it does look good too. guess I will have to wait to test its quality.