Hi all, I recently picked up a set of 3a's and am in the process of getting them into shape but I have some issues with the Mids. ( I sold my original pair of AR3a's back in the 70's when I was young and stupid!) The speakers have alnico magnet, cloth surround woofers which appear original and are in excellent shape. The tweeters are also original. The mids are different. One appears original and seems to have an alnico magnet (very deep unit) while the other has a ring-type magnet. The ring