On Thu, 16 Mar 2006 22:25:37 +0100, Sander deWaal
wrote:

"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?

Problems? I made one years ago and RFI was much less of a problem
than I expected although a few things exoloded in the early days. If
all else fails use Filtercons.(sp?)