"Trevor Wilson" said:

**What Tannoy are suggesting is of limited benefit, since most of the
problem lies with the speaker cables themselves. And only under extreme
conditions. I have encountered the problem a few times, where the client
lived close (less than a few hundred Metres) to a local TV transmission
tower. The high power RF insinuates itself on the speaker cabling, then
enters the amplifier (through the outputs) and is then routed to the front
end of the amplifier via the negative feedback line. The only solutions a

* To shield everything in the speaker circuit. This includes the cables, the
crossover and the speakers themselves.
* To use an amplifier which has no global NFB or one which uses 'nested'
feedback.


Trevor,

Do you have any experience with class D amplifiers such as the Hypex
UcD modules wrt. RFI?

--

- Never argue with idiots, they drag you down their level and beat you with experience. -