The 2ci is quite a bit older, I bought mine about 15 years ago. Definately some improvements in drivers and the input bananas were replaced with a barrier strip that takes small spades.
I believe the 2Ci didn't stay out for long due to the tweeter. I don't know if anything else was upgraded but I remember that people weren't happy with the sound of the tweeter.
The 2ci used a 3/4" tweeter that is not near as transparent as the 1" in the 2Ce. Beware, however, that there are some 2Ce's with the same 3/4" tweeter. Check the serial number with Vandersteen. He didn't have the 1" on hand for a while and substituted the 3/4". How do I know? I had a pair of the 2Ce with the 3/4" tweeter back in the early 90's. other than that, they are pretty much the same.
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