Primacoustic Monitor Isolators
Primacoustic makes a killer set of studio monitor isolators they call "Recoil Stabilizers" for your recording studio's loud speakers. By placing these isolators between your speaker monitors and monitor stands you gain a high quality of sound isolation preventing disruptive resonating vibrations. I have found that they give you cleaner bass tones and more a accurate frequency range. The isolators are made from high-density urethane foam to form the isolation base, a heavy duty steel plate to give the unit stabilizing mass and weight, and a thin neoprene top layer to prevent the speaker from slipping due to vibrations.