Take my opinion with a grain of salt. The dealer set the Treo CT's and the one 2Wq sub up meticulously. I gave him a few days notice for the demo. He played some incredible music cuts for me. Guess I got caught up in the moment. Even Richard Vandersteen said this was one of his better dealers and said he had a fine ear for different kinds of music. This was in Wisc. I now live in Arizona. I listened to the Quatro Wood Ct's at a Hifi Shop in San Diego. I listened with similar music and while it sounded good, it didn't grab me like the Treo Ct. sub combo did. That store in Wisc. had to my ears what seemed to be almost magical. Some of the best sound I ever heard and I've heard some pretty fine systems over my 45 years as an audiophile. I previously mentioned that I own a pair of Treo Ct's, and couldn't be happier. After listening with a Vandy sub, I really like the way the sound opens up the stage and gives you that incredible sense of space and timbre, something you don't quite hear with the Treo's on their own. This is what the sub does for me, not just giving me a handful of hertz at the bottom end and more dynamics, although I still consider these aspects important to the music as well. In regards to the carbon tweeter, it also helps down into the mid-range where the vocal region resides. I have listened to the standard Treo at length, and the resolution of the carbon tweeter, to my ears, is well worth the extra grand. IMHO. Happy listening to all you new Vandersteen owners out there!