I'm not sure whether it corresponded exactly with the addition of the "i" designation but earlier versions of the SAT 5 and the 5.3 had soft-dome tweeters and the "i" versions had aluminum tweeters. I don't know about differences in the construction or crossovers.
Yes, I don't know about the 6.2i's but the later 5's definitely had aluminum tweeters. I just had to replace a bad tweeter in my SAT 5's and the only ones still available were the aluminum ones.
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