There don't seem to be any ProAc dealers anywhere on the East Coast; when I enter "New York" on their "Worldwide Distributors" page, it suggests a place in Toronto.

I did have a good talk with someone at Madisound; he was very helpful, but I'll need to do more complicated measurements for them to be able to help. Meanwhile, he suggested I get in touch with Speaker Repair of Colorado, so I've done that, and am waiting to hear back.

I really don't want to be in the position of literally throwing them out.

My friend bought his ProAcs here. Give John Rutan a call. I'm sure he will help you  out!

https://www.audioconnect.com/our-brands/

Do not throw them out.  ProAc Tablettes are very nice sounding speakers.  I would try to find the right replacement driver--not something off the shelf that might be a close, but not ideal, match for the original driver.  Locate the right driver, from or according to ProAc, and it should be easy to do the replacement yourself or have any competent dealer do the replacement.  It doesn't have to be ProAc doing the replacement if you have the right parts.

I did a quick search on Google and came across this:

a little proac info.

Discussion in 'Hi-Fi and General Audio' started by Lt Cdr Data, Dec 28, 2003.

 

Proac are a little mean on what they divulge, so I thought I would share a little of my hard earned knowledge, and give a kind of database of proac info for fans and curios
.
for some great proac klones check this out.

http://audioclone.free.fr/scanspeak.html

Older proacs are divided into 3 ranges,

1/the tablette
2/studio
3/ response

tablette 3, 50, 2000 inc. signatures use seas woofers and seas or scanspeak tweeters...2010 on signatures.

https://www.audio-forums.com/threads/a-little-proac-info.85593/

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https://www.google.com/search?q=seas+woofers&source=hp&ei=sq0nZOD9MLqZptQPyIiD-Aw&iflsig=AOEireoAAAAAZCe7whMu2J2569iXq4MTShbcYU_nU0zR&ved=0ahUKEwjgnraR54f-AhW6jIkEHUjEAM8Q4dUDCA8&oq=seas+woofers&gs_lcp=Cgdnd3Mtd2l6EAwyCAgAEIoFEJECMgYIABAWEB4yBggAEBYQHjIICAAQigUQhgMyCAgAEIoFEIYDUABYAGCsPWgAcAB4AIABgwGIAYMBkgEDMC4xmAEAoAECoAEB&sclient=gws-wiz

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Great info on this thread.  Nice research.

Just curious--after reading of these multiple accounts of woofers going bad I am a bit baffled (no pun intended).  Even driven to higher spl's, it seems odd to have woofers fail.  Thinking of how many vintage speakers voice coils have endured half a century of music making.