Ahh, and it is doing a fine job :)
Pgawan2b, i have had studio 10's, 20's, 60's, all V.4, and I also had Studio 40's V.3. I couldn't live with them because they were way to bright for me. I think they are built well, and look beautiful but too hot. I ran all those in the same set-up I have currently, except I had a Classe CA-150 at that time.
Sooo, these Signature 2's with the berrylium tweeters are so much better. They do have a similar house sound, just much more refined, and the highs aren't in your face like the Studio series. Great extension on both ends, and the highs are detailed, nuanced and airy. I love these Sigs, and I don't know that I'll ever sell them, unless it's to move up to the S6's. I also really like this Classe CA-200. It sounds like the CA-150 but with more headroom.
It's strange, but to me the studio's sound dark and too bright, if ghat makes any sense.