On Fri, 19 Nov 2010 13:01:19 +0000, N_Cook wrote:

Bass driver giving off a noise like frying bacon of fairly constant
level compared to varying audio level. They had used epoxy glue and soft
contact glue at 2 different stages of fixing the spider to the frame.
Epoxy had squeeged into the interior forming beads of solid epoxy up to
about 10 mm long by about 2mm that had later broken off and was rattling
inside. So gummy/soft glues only is the lesson . As there is always bits
of sub-mm aluminium oxide etc , but greater than air filter mesh size ,
inside speakers, that don't seem to make any humanly observed rattling
interference noises , anyone any idea what is the size that becomes
intrusive ?. In the core that is , not staples etc on the outside. RoHS
stickers all over and all sorts of other problems in the cab but not PbF
isssues (this year)

You want to know the size of a particle that could cause a rub between
the VC and the magnet structure core? Is so I can't imagine it would take
much knowing the tolerances around the VC are measured in the tens of
thousands of an inch. I've seen several of these type and guitar types
get re coned living near an individual who did re-coning for a living.
Some of the shims used while gluing especially in a studio monitor
speaker like a Tannoy I saw get re-coned looked to be around 1.5 mil or
slighlty more.



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