On 5 Oct 2005 03:43:34 GMT, "Ray Thomas"
wrote:

Hi all,

My friend has a pair of early-mid 1980's B+W DM12 speakers. The soft dome
tweeters seem to have significantly diminished HF response over recent years
(both left and right units equally), and I'm wondering if this is
possible..ie what is the mechanism for this degradation ?

I would check the filters if I were your friend. There is a great
possibility that the filters have capacitors that is out of spec,
which may lead to the effect you describe.

Per.