DuPont Zircon M sand is the most dense ( Heaviest ). You guys think you’re so anal, you should spend some time around competitive Bench Rest shooters.
In the sand box
I have 2 audio buddies who have built component sandboxes with different types of sand. They claim Beach sand is the most dense and made a huge difference when the turntable and amp were set in them. Has anyone else been down this road? I mean there are several ways to isolate equipment, this is just one of many.