Simple Tweak (atleast, gives me peace of mind from External Interference):
Gulf region is one of the busiest areas in the world in military operations. Maybe, dozens of different satellites of various activities focus on this area. All of them are emitting Very High Radio Frequency signals and other Sophesticated Radio Waves that will swamp to any unshielded audio interconnects and other audio devices.
The use of Ferrite Core/Clamp is another line of deffence against RFI/EMI that affects the performance of our system. It's also advisable to those living near Radio Stations, electrical transformers,Towers of hi-tension cables, Cell sites and other installations using radio waves.
For Audio/video applications, I have them on all power cords, audio interconnects and speaker cables negative wire @amp side.Can be used also to all electrical appliciances.
For further info can check this link:
http://www.leadertechinc.com/bisectedround.shtml 
