Proper tilt position with the Vandy's is crucial for the best possible sound, in order to maintain the time/phase alignment that Richard designs into the speakers. Go to the Vandersteen website and read the manual. Pay special attention to page 8. It's definitely worth the effort. Good Luck, and Happy Listening !
http://Vandersteen.com/2ce_signature_ii_manual.pdf
http://Vandersteen.com/2ce_signature_ii_manual.pdf