I believe that Elizabeth got it right. I tried rocks, sand, can of tomatoes, a metal tray, etc.....they all changed the sound somewhat, however, the ring sounds the best.
A New Use for VPI Flattening Ring
I was minding my own business listening to a CD, when I put the VPI ring on top of my Ayre amp. I couldn't believe it, but there was a new found focus...a clarity, an ease that wasn't there without the ring. The timbre, etc. remained exactly as before....just the increased and welcomed focus. What's up??