the original Signature had un upgraded crossover, different tweeter and other changes...and Vandersteen has made changes at times without changing the model number/name, as do many manufacturers
Not a 3A Sig, but I own the 2A Sig 2 and love it. I believe the 3A Sig and my 2A sig 2 both uses the same tweeter and midrange driver of the Vandersteen 5A
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