Turntable Rack Mounted to Foundation

If you have a good solid floor like concrete it will work well.

If you are in a real basement, the "walls" are probably either concrete or concrete block up at least 5 feet or more. In which case you might want to consider mounting a couple of 6 foot long butcher block (maple) shelves on welded steel brackets that are lag-bolted every 2 feet into the wall.

It's not that there's anything wrong with a rack unit sitting on a solid concrete slab floor, except that very few of them are truly rigid, and always require some kind of isolation shelf.

Properly designed and detailed concrete or block Wall-mounted surfaces can't move -- period.

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Nsgarch

The plan is similar to what you describe. I wish to isolate the components from the room doing what you described. Almost as if the components are floating in air.

I would think the amount of vibration going through a concrete floor and then up a concrete wall would be minimal. I use monitor speakers with a 7" woofer in an 11' by 22'room so I'm not rattling the windows and bringing the house down.

However I could be wrong any thoughts people?

Let me clarify: when I said "very few of them are truly rigid" I was referring to audio racks, not concrete slabs.

Concrete slabs don't vibrate in the audible spectrum, and almost not at all in the mechanical spectrum (below 12 Hz. or so) therefore it's unlikely, unless you live next to a railroad line or an interstate, that you'll have anything to contend with except airborne vibration from the music itself -- and that's really negligible, even for turntables, unless they're positioned right in front of a woofer (also unlikely I imagine?)

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Thats basically what I thought thanks for your input