It is possible that the speaker cone or the rubber surround degraded with
age, or it was over driven and the voice coil became warped and it is
rubbing against the magnet.

A common cause of speaker damage is from being over driven. If the amplifier
is under powered to handle the speaker or too much loudness demanded, the
clipping effect can damage the coils in speakers. This is because the
clipping causes some DC signal to reach the speaker.

The fix is to have the speaker re-built, or to replace it.


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JANA
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wrote in message
ups.com...
I have a subwoofer in which there is a strange noise with the speaker
as if the voice coil or the cone of the speaker is touching somewhere
so wat to do to prevent the noise . . .