I always thought that the 123a-1 did some things better than the other 12" woofers like the 122a, 126a and 128H. It just seems to transition better to an LE5 series midrange driver. The 2213H with the ceramic magnet does not sound as good as the 123a-1 to me at least. I don't think it has anything to do with the magnet material but rather a design change.
Mike
I have the AlNiCo versions of both, and the 2213 has a little higher Qes and lower Le in the examples I have. This appears to be due to a revision of the voicecoil winding, from what I can tell. The 2213H was one of the early ceramics, as far as I know, and lacks some of the features that brought the later ceramics 'up to snuff' like the SFG polepiece shaping and shorting ring. I could be wrong here, though, as I've looked for a datasheet and not found one.
The AlNiCo 2213 is the same as the 123A-3 fwiw. I do prefer the less obstructive frame on the 123A though vs. the 2213/123A-3.
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