I've heard the 3a and Treo ct many times and they are absolutely fantastic. They do justice with all types of music especially complex classicals and rock. Then again, the source and amp was all Ayre acoustics. I don't think it's the speakers. Tell us what components your using and the type of speaker wires.
Vandersteen
After hearing many good things about Vandersteen speakers I purchased a pair of 3a signatures. They sound beautiful with chamber music or small group jazz but quickly fall to pieces with symphonic works or rock. Have other people noted this deficiency with Vandersteens?