"Jim Lesurf" wrote in message
...


FWIW If you are worried about 'RF' then you should also worry about
interference which is directly radiated into units. e.g a mobile phone in
the same room as the audio system, coupling in via the speaker leads. A
mains filter will have no effect on this. Hence it is the kind of thing
the
designer should have considered...

Hello Jim. That was to be my next question. In some digital production
suites, the use of mobile phones is strictly forbidden, and the receptionist
takes them from clients as they come in the door.

Is coupling via speaker cables the only way that mobile phones can
affect a domestic system? Do manufacturers take mobile phones into
consideration, and how?

Iain