On Sat, 2 Sep 2006 15:04:27 +0100, Derrick Fawsitt
wrote:

I have just acquired a pair of Quad 989 ESL speakers and am delighted
with them. I have however reported to Quad that there is a slight
"fizzing" noise emanating from one of them. You have to put your ear
close to it to actually hear it. It started to occur during the
extremely hot weather we had recently here in the UK and Quad said they
were inundated with calls about other users experiencing the same
problem and that it might be due to the high humidity. However, it has
persisted up to now despite the cooler weather and yet I am reluctant to
have to haul my spanking new speaker into my car to bring it to Quad
over what appears to be a minor problem, or is it? How should I regard
this, is it serious or potentially serious and what action should I take
in the matter. The speakers are not easy to transport and I am reluctant
to stand them up, (in case they fall), or lay them down on account of
the "stress" it might put on the panel in relation to its base.
What to do please, I would be so grateful for help and information.

The two usual causes are moisture and dust. You appear to have
eliminated the first, so maybe it is the second. Can you localize
where it is happening by listening, or is it just coming off the
diaphragm as if it were a signal? If the latter, it will be happening
in the power supply. Peering inside with the room in pitch darkness
can help find it - it will probably be a dim purple glow rather than a
spark, if it shows at all that is.

Otherwise, it is back in the car, I'm afraid.

d
--
Pearce Consulting
http://www.pearce.uk.com