I would not be surprised if you find that applying Blu-Tak to the bottoms will kill the energy and transient attack of the speakers. I was using some very heavy, solid stands under my de Capo's, and when trying to adhere them to the stands with Blu Tack, it dampened the sound of the speakers and sucked the life out of my system. Blu Tack works fine with some speakers, depending on the cabinet design, but on others it kills the sound. I put some Blu Tack under some small Triangle monitors I once owned, and I could not believe how bad it made them sound...like throwing a heavy tarp over them. Some speaker cabinets were designed to resonate and vibrate, and adhereing them to heavy stands muffles the energy of the speakers and kills their "speed". Try it and listen....Start with a minimal amount, one small, dime size piece in the front middle, and one in each back corner. Listen to some recordings that have good attack and percussion (snare shots and well recorded piano pieces) Only use it if you are worried about the speakers getting knocked off the stands.
