I second the info posted by Robert and thank you for that. I have a pair of A2 with blown-out tweeters. This week I was lucky to find not 1, but 2 pairs of Celestion 5 (for just $30 for both, yes that's true) and used their diaphram with the old A2 magnet, since the the A series tweeter has a Faraday ring that the Celestion 5 model does not. JUst replace the housing. Look for another thread to see how I replaced it.