I have a pair of LE-10H's that were refoamed by a local speaker repairer, but within several months had started audibly distorting when playing deep bass music, such as dub.
I took them back to that same company and they told me that the black foam, near the centre dome polepiece hole, had disintegrated and had fallen into the gap.
They said it took 2 hours of labour (£100 or $155) to repair both drivers but that they are now 'as good as new'.
Not being a technical person, I'm just interested to know if all this sounds credible and genuine?
Incidentally, I did raise the question as to why they hadn't noticed the issue when they had done the refoam several months earlier but didn't get a clear answer back on that. I guess it's conceivable that the deterioration took place during those seven months .
(BTW- this is not to be confused with a different set of LE-10's that I made a thread about recently)