I was getting sound from resonance on glass shelving through my TT. I put a pad under each foot. The isolation and vibration dampening provided made that noise go away. Because they are so inexpensive, I also threw a set under my CD changer. I bought enough for my other systems, too. I have not set them up yet. I apologize for not knowing better terminology to describe the hollow sound that I could hear resonating. It was similar to the change in sound I hear when putting a dust cover down on a TT while it’s playing (something I find undesirable). Sent from my iPhone using Tapatalk