"Gareth Magennis"

I suspect the speaker most probably didn't fail, it was overdriven and was
broken by a Human Being.

** Still called a failure by most.

If you force the cone to move way beyond its limits,


** That should never be possible using electrical input alone. It is simple
enough to arrange things so the voice coil moves out of the magnetic gap and
loses most of the driving force before mechanical damage occurs.

However, some sub woofers are designed (?) with very long voice coils
rendering this precaution impossible.

Such woofers are bound to fail.


it will indeed eventually pull its own braids out to stop the torture.


** That should not be the case - easy to make the braids long enough so
any possible excursion is allowed


I gave up years ago trying to repair this sort of damage as it never holds
up for very long.

** Fitting longer braids is possible, done that a few times.

I had one job where the two braids had welded together half way along - the
maker ( Alesis ) had arranged to braids to vibrate towards each other and
touch if enough level were applied. Shortening each braid fixed it.


Mostly because the user is incapable of understanding that it was him that
broke it, so quickly breaks it again,


** Had one guy who repeatedly damaged his JBL K120s this way. He had them
in an open backed 100W Marshall combo amp and played BASS guitar through
them.

JBL specifically warn against doing this with the K120s.


...... Phil