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I would have to say that it depends a lot on set-up, room, tuning, etc. Ultimately it makes sense that the Quatro is the better speaker overall. I don't think RV would have come out with it if he didn't think so. The 3A Sig is a very fine sounding speaker but I think that the Quatro and especially the new CT version trumps the Model 3A Sig in resolution especially. The 3A Sig with a pair of Vandy subs was once thought to give you 85% of the performance of the Model Fives. I think the option of being able to place the subs in the perfect spot in your room is one of the nice things about the 3/sub combo but don't think it will resolve with the transparency of the Quatro CT's. I heard the CT version of the Quatro's at Audio Connection in N.J. and they were incredible. I have the 3A Sigs and I've been constantly squeezing more performance out of them over the years. Everything makes a difference with these speakers and you can get a lot of mileage out of them. Set up is crucial with all of the Vandersteens IME and that's what some users fail to realize. When John Rutan of Audio Connection came over and did the laser alignment and tilt adjustment, things snapped into place and the sound improved 30% at least. In all areas!!In addition to John helping I experimented with different gear to to custom tailor the sound to my liking and I'm very satisfied with the results.I don't have the subs with them due to space limitations in the room they're in but I do have one 2W sub with a pair of Maggie 1.6's in another system that's quite magical as well. Whatever model you choose spend time experimenting with set up, associated gear, etc to get the most out the speakers. You won't be sorry.I think an interesting comparison would be the latest 3A Sig against the Treo. Maybe someday at Audio Connection John? Wonderful hobby indeed.