try some proac dealers local to you
a dear friend of mine had woofers on his response 3.8’s go bad and a longstanding san jose retail/repair shop who handles proac procured fresh replacement woofers for him, all is well now
you might need to do some legwork but proac has many dealers and i am sure some will help even though this isn’t a big money maker for them
the new proac distributor can be a little hit or miss when end users contact them, i have found