Basicaly a bump. I have heard both but in different systems and enviornments. One thing I have noticed is the asymetric off axis response of the 3a.
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Ref has the tweeter off to one sideand that affects its lateral response. Stereophile has a revoew and it shows the tweeter likes more baffel to reflect against. Smother response when listened with speaker rotated so the tweeter is away fron the listener. Hope that makes sense as this IS new years day. . .is'nt it?