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Refurbishing Avalon Ascent Mk 2

After 25 years of service my Avalon Ascent Mk 2 have started to distort especially with classical piano.  I have isolated the problem to both 2" aluminium-manganese mid drivers.  These, I believe, were built by MB Quart of Germany, now out of business and the part seems unavailable.

I would greatly appreciate any suggestions on how I could bring back these speakers to their former glory. Thanks.

franzschubert
roxy54's avatar
roxy54
2,651 posts
 
If you can't get the original replacement  drivers I think it's time to go shopping  for new speakers.  But maybe there is something  wrong with both drivers that is repairable.  Why not remove them and investigate? 
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gs5556
769 posts
 
Did you try different components? I had the same problem with my Thiel 3.6 speakers distorting certain solo piano notes and Thiel said they could rebuild the driver if I remove it and send it to them. However, I picked up an SACD player and the distortion did not appear when playing the same disc. Turns out it was a bad polypropylene cap in the analog board of my Theta Gen Va.
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