Make sure to experiment with the placement and "directionality" of BDR cones, if you use them. I tried a few different cones/points under my amp which was already sitting on a Osiris Giza stand on its own points and pucks filled with about 40 lbs of silica sand. A couple of the tweaks I tried made things sound worse. I tried the BDR III's and they made some decent sonic improvement, but nothing drastic. Then, one day, for kicks, I turned the cones over so that the small end pointed up. The improved tightness in bass and clarity in the upper top end left me agog. A very nice surprise.....