On 19/01/2016 20:54, Gareth Magennis wrote:


"N_Cook" wrote in message ...

Nastly little magnetic tweeter/mids ?
As a 47uF NP cap is over one, for mid?
Anyway nasty buzzing overtone as though a bit of steel swarf or staple
has got on the cone of a larger speaker.
These things have brushed aluminium inverse dome covers on them, do they
work loose, swarf dislodged inside?
Of course close-handling has "cured" the problem, but bound to return
without proper treatment






I take it you mean a **** hi-fi speaker with a one inch voice coil.

Have you checked it's not a Surround problem? i.e. the attachment to
the outer rim of the chassis has failed.
Or sometimes the dustcap itself comes loose and rattles.
Or sometimes the bottom spider suspension becomes detached from the
inner part of the chassis.



But mostly its because the owner has blown it, and there are burnt or
loose pieces of voicecoil rubbing intermittently.


You might also check that the magnet hasn't become partially detached
from the chassis.
That's a good one for a pub story.



All the above much more likely than an otherwise foreign body entering
the gap.
In my experience.




Gareth.







So far, 3 pages worth of images, I've not found any replacement ones
available anywhere, 4ohm, presumably about 3W, actually 30mm not 1 inch
diameter. So I'll unglue them and see what I can see