Ethernet-over-mains products such as Homeplugs offer an inexpensive and convenient way of creating a virtual wired network in your home. They are plugged into mains sockets and carry network data over your existing mains wiring and are connected at each end to networked devices using Ethernet cable. In many cases these are a great way to create a strong interference-free network.However we have found cases where depending on the nature of your mains supply adding a network signal to it can have a detrimental effect on the quality of mains supply and can cause unwanted noise in audio components. While this is not guaranteed to happen and can cause unwanted noise in audio components. While this is not guaranteed to happen be aware of the possible effects including hum and distortion.  If your mains supply is prone to introducing artifacts to the audio chain this will be quite obvious to hear when no music is playing; if there is an audible hum from your speakers when Homeplugs are turned on they should not be used.If you hear no difference then you can use them with confidence