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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.
franzschubert OP
19 posts
 
Yes I have tried multiple amps, preamps, DACs and cables.  The distortion remains.  It is only ameliorated when I disconnect the midrange drivers .... hence my conclusion that they are at fault.
dlcockrum's avatar
dlcockrum
2,105 posts
 
Hi franzshubert,

Try placing very small pieces of Dynamat on the dustcap of the offending drivers. It may take several attempts to find the right spot but this may work. Worth a try.

Dave
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