If by physically you mean cosmetically, they are exactly the same. I believe there were tweeter and crossover improvements. A friend of mine has a 3 and I have a 3A Signature. The difference is that the 3 appears to have a more powerful bass, which is probably not as smooth, but definitely is more "iron-fisted". Both the 3A abd 3A Signature have better highs than the 3 and overall a slightly more refined presentation, but the difference is not marked. All three models have their strengths and weaknesses. Overall, I would say that the 3A Signature is a slightly better speaker, but considering the number of years since date of manufacture, all will do well in a current system.
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