I've recently bought some 7A's. I'm not sure how old they are, but they have a single fuse. My question is this: The middle speaker really moves a lot, particularly when playing sound with very low frequencies (eg. an outdoor recording with some wind noise), much more than the woofer. Could it be that they've been modified and/or they're not sending the right frequencies to the right speaker? I doubt this since they don't sound especially strange -- not as bass heavy as I would like perhaps, but nothing obviously odd. (I'm using a Yamaha HTR-6190 amp.)
Just thought I'd pose the question nonetheless. Those mid speakers REALLY move a lot.