Russ Andrews Mains Zapperator - Mains Filter. Excellent condition, very little use. Current RRP £227.00 Especially useful for combating noise created by Wi-fi networks and ethernet-over-mains.Can be used near to your equipment and close to sources of noise.Simple, plug-in design.Mains Zapperators are designed by respected audio designers Ben Duncan and Paul Houlden, and are available exclusively from Russ Andrews. They can be used on their own or in conjunction with Silencers, Purifiers and cables - or any other manufacturers filters and cables.Our listening tests have shown that theyre particularly useful in houses with wireless computer networks, and also in houses that use ethernet-over-mains computer networking. With the proliferation of wireless computer networks (not just in our own homes, but also our neighbours) and ethernet-over-mains (again, even from neighbours), Mains Zapperators are designed to specifically target the noise these devices can put onto the mains supply. Due to the complexity of Radio Frequency Interference, its worth experimenting with the location and quantity of Mains Zapperators to find the best effect.