On Fri, 20 Feb 2009 22:18:58 GMT, Rob
wrote:

I think one of my Dynaudio Contour 1.1 speakers has a fault. On music it
sounds as though something's rattling inside, or one of the drivers is
loose. I've taken the woofer out and it looks OK, insofar as I know what
OK is - nothing burnt or blown.

It's difficult to replicate with music, so I recorded a tone and this is
what it sounds like:

http://patchoulian.googlepages.com/speaker

It's a 500kB mp3 file.

Short of contacting Dynaudio and asking about a replacement woofer, any
suggestions?

Thanks, Rob

Sometimes the cone suspension can sag a bit, allowing the voice coil
to rub against the magnet. The way to fix this is to rotate the
speaker 180 degrees before you bolt it back in, so it can sag back the
other way again. If that doesn't fix it, then in all probability the
coil has overheated and some turns have lifted and got loose.

The waveform from the other speaker is none too special either, I have
to say. Have they had a hard life?

d