regluing speaker cones

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I have a 40 year old pair of Altec Lansing 15" multiway speakers.
The cone has come loose on one and I suspect the other will soon
follow. I understand there are companies which specialize in
repairing these. Has anyone had experience with these?

Purely FYI, the speakers have a low end resonance of about 20hz and are enclosed
in 7 cu ft cabinets homebuilt using Altec plans. They really play the
big organ pipes right (or at least they did). They aren't voice of the theatres
but close. 501C I think.

Many thanks for any info.
 
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