Isotek mainline power conditioner/filter for cleaner, less noise and improved performance of audio and hi fi gear. The unit has 2 x 1m cables with a simple sturdy box in the middle. This simply plugs into your regular wall socket (UK) and then feed your unit (I used it on the amplifier) into the 3 pin female socket.  There are sceptics out there with opinions on weather you "need" a mains power conditioner or if it makes any difference, so this will be aimed at use with high end equipment. There are a few videos explaining the theory behind using this kind of unit on youtube. https://www.youtube.com/watch?v=blPdqwDNar8 These sold at £290 in UK stores.