I used the same method that @ mijostyn used, lag bolted into the studs of a load bearing wall in my music room for my Linn LP12 that has it’s own spring suspension.
I now use a Symposium Segue (previously was using baltic birch plywood) as the shelf platform that my turntable rests upon. I can literally jump up and down in front of the turntable and the needle does not leave the groove. I can have a glass of water resting on the shelf and there is no ripples in the water... this is true whether using the Symposium or the Baltic Birch shelf. This system works great in regards to foot fall problems, which is what I was experiencing (due to having suspended hardwood floors) prior to this solution. I’ve been using this system for many years and absolutely love it!
Best of luck :)
Don
I now use a Symposium Segue (previously was using baltic birch plywood) as the shelf platform that my turntable rests upon. I can literally jump up and down in front of the turntable and the needle does not leave the groove. I can have a glass of water resting on the shelf and there is no ripples in the water... this is true whether using the Symposium or the Baltic Birch shelf. This system works great in regards to foot fall problems, which is what I was experiencing (due to having suspended hardwood floors) prior to this solution. I’ve been using this system for many years and absolutely love it!
Best of luck :)
Don