Granite surface plate

I second Roxy54 recommendation of Adona shelves. Been using them under my TTs for years.

The Adona shelf won't cost a fortune, and it's just a "set it and forget it" solution that avoids a lot of experimentation and looks good.

I have granite shelves in my equipment closet and have no ringing problems at all. I have rubber vibration pads for the appropriate weight between the shelves and the shelf support, a sheet of sorbothane secured to the bottom of the shelf that the turntable sits on to dissipation energy that the pads do not deal with. I have no ringing at all from any shelves.