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In Reply to: RE: Vibration Isolation Technical Article- Interesting posted by mr.bear on June 19, 2017 at 23:41:21
Which is why the two turntables in my second system, which sits on the poured concrete floor of my basement, which in turn sits on solid earth, are so clean sounding. Because of the concrete base, there is not much effort required to isolate the turntables. No fancy stands or shelving need apply. They're sitting on an old but very solid wood dining room side table on dense cork or styrofoam like pads that are used to pack heavy but delicate instruments for shipping. (Someone at a warehouse gave them to me for free, years ago.) I've got those square pads shown in your photo, and I do use them, but I cannot hear any difference with or without them.
Follow Ups:
...experience agreeing with theory! Those little Mapleshade-style pads I'd expect to be useful only in the audio frequency range when loaded with ordinary turntable-size masses.
My best system is in my basement, also. Poured concrete floor, turntables sit on a custom wood stand and I also have granite counter-top underneath the turntables. Zero issues with vibration.
Thomas
"In a democracy, uneducated voters get the leaders they deserve."
Concrete doesn't isolate anything sitting it from floor borne vibrations throughout the audio band.
Well, you can jump up-and-down in front of my turntable and it doesn't miss a beat. Perhaps the advantage of concrete is that it attaches my turntable securely to the earth, which doesn't seem to vibrate very much where I live. I can't even get the earth to to vibrate by jumping up-and-down. YMMV
Good luck,
John Elison
The main fact in my case is that the concrete slab is on solid earth. However, I would think that concrete per se is not so bad because its porosity should help to dissipate energy as heat. I am prepared to be proven wrong, however.
Exactly as above.. My Thorens, which has for 35 years lived in my concrete floor slab/carpeted Listening room.
Had Zero vibration/resonance issues.
However it exhibited foot fall issues when relocated to the 3rd floor of my house.
It went back down to the main system .. quickly.
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