Where is Your Turntable?

4yanx -- is there another wall, right behind the first one your wall shelf is attached to, that joins it at a right angle just to the right or left of where the wall shelf is?? (I hope I'm right on this one!!) What might be happening is the horizontal vibration in the first wall (created by the sound waves) creates a twisting motion (rather than just back and forth) around the point where the perpendicular wall joins it from behind, creating more motion out at the front of your wall shelf than at the back where it joins the wall. Placing the wall shelf right over that point would be the best place. Just a wild guess!! :~)

Although I'm an advocate of wall shelves for TT's, a big, expansive stud wall, using 2x4 studs 16" apart can vibrate like a bee's wings! Then, the only usable location is near a corner or adjoining the fireplace (unless you can figure out how to brace the wall from behind.) In those cases, if you're on a concrete slab, I say get a great sand-filled turntable stand with spikes biting right into the concrete.

No, it is an outside, load-bearing wall with no perpendicular walls, though I understand your point. Built in the 50's it has 16" spaced studs AND angular bracing between studs (I know because I stripped off and replaced old knotty pine paneling!). So, wall vibrations were really not the issue in this case. Moving the rack 2 feet fully solved the issue, so I was always under the impression that air-borne vibrations were, indeed, the culprit. I can set a glass of water on the rack now at cranking volume, without so much as a ripple on the surface. I now use the wall rack for one table with two other tables sitting on sand-filled Osiris Giza amp stands. They all sound equally good, can't pinpoint any benefit of one placement over the other.

Well then 4yanx, there can only be one other explanation -- termites!!

Hre in Clifrnia, tht can alwys b a pssble isu.

In my daughter's room (temporarily) -- she thinks vinyl is cool. We'll see how long it lasts.