Some high density foam will help too.

If you feel like spending a couple bucks MoPADs helped a great deal under my center channel which is on a glass shelf.

Edit: Or the SpeakerDudes.

Last edited by ClubNeon; 10/22/09 03:16 AM.
Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris