There's a pair of 3.6's listed here for $2400 (no affiliation); so start with that as a reference. You say up to $1000 for a rebuild. Does that include the shipping? That will be expensive. Will they replace the ribbon tweeters for that price? I assume that replacement of the ribbon tweeters is not included. The original III's are going on 30 yrs old +; no? That means that even if you have the mid/bass panels refurbished, you will have 30+ yr old ribbon tweeters. The 3.6's are a definite improvement over the III's, particularly in the area of the integration of that great (and very fast) tweet with the midrange. But the III's are still a good speaker.
If $1000 includes shipping and new tweeters, I would say keep the III's, if not, then I would seriously consider the 3.6's. Good luck.
BTW, the only difference between the 3 and 3A's is the shifting of the xover point for the midrange by the addition of a 12mf cap.
If $1000 includes shipping and new tweeters, I would say keep the III's, if not, then I would seriously consider the 3.6's. Good luck.
BTW, the only difference between the 3 and 3A's is the shifting of the xover point for the midrange by the addition of a 12mf cap.