I have seen where something mettalic as small as a staple has been
attracted to the dome in front of the magnet making a disturbing noise,
but easiliy removed.

Bob Urz wrote:



N Cook wrote:

Anyone come across the situation where presumably some crud that was
otherwise safe in the bottom of the voice coil slot is now shifted and
causing distortion.
Owner in the habit of transporting face down - to avoid anything falling
onto the front face.
Any opinions on transporting face-down or cures. ?
Try operating for a while horizontally perhaps but face up or face
down.?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



Usually, speakers fail like this from being dropped and the magnetic
magnetic assembly shifts. When this happens the pole piece rubs against
the voice coil. Speaker is usually toast when this happens.

Also, if the speaker has been over excursioned from abuse, the rear of
the voice coil warps and rubs on the pole piece during times of higher
excursions causing a scratching rubbing sound.

I had a yamaha 4115 drop vertical once and it shifted the magnetic so
much that it froze the voice coil.

I had a grundorf trap that fell over that snapped the magnet/pole
piece off the cast frame.

Bob

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--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

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