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In Reply to: RE: Constrained-layer Platforms posted by Ferrstein on April 19, 2010 at 06:38:18
OK, here's what to try first: get rid of the nuts and the maple shelving and put the rollers how they are meant to go: between your amp bottom and your sandwich shelving with the ball against the amp chasis.
If you're concerned that the 1" chasis bottom is flexible, then try a small sheet of hard aluminum, such as you have on your sandwich, double-sided taped to the bottoms where the balls will touch them. If that is a shiny smooth aluminum plate, it will maximize the rolling while minimizing any flexing.
But either way, you misunderstand what the rollers do.
What they actually do is NOT isolation, it's coupling. They couple metal to metal to metal in your case via the small point of the ball top and bottom. How they work is that they move both rotationally/horizontally and vertically (small bit up the increasingly sloped sides) to convert the energy of vibrations partially into heat of friction.
Your sandwich works more closely by a form of isolation similar to a seismic sink. That is, it also converts vibrations in the vertical plane into heat at every interface between the different materials.
Your nuts are not optimized couplers like the roller balls. Your maple platforms are not optimized isolators, they're more like tuning blocks. Your sandwiches ARE an optimized seismic sink.
Follow Ups:
Thanks again for your perspective - geez, I should have posted my plan first... it took me an hour to get this rig set up!
I actually have some 7075 aluminum discs that I can attach to the bottom of the amps. I'll give that a try. I would like to loose the Maple shelves as they take up too much vertical space.
BTW, I take exception to your statement that my nuts are not optimized. 8^)
Rollers couple VERTICALLY and isolate HORIZONTALLY.
Your second point is arguable, but it's not worth having the argument.
Key is that he's not understanding what the rollers do mostly and he can do better by rearranging his stack.
"Key is that he's not understanding what the rollers do mostly and he can do better by rearranging his stack. "
Again, I appreciate your feedback... but I don't think there is a right answer here, and I don't think I fall into the camp that "doesn't understand". A pure horizontal vibration mode will be isolated by the rollers. Better put, a pure horizontal vibration mode borne within the amps will not transfer into the stack of the constrained layer shelf through rollers as well as it will through rigid couplers. I agree that the rollers will couple the same as rigid couplers for pure veritical vibration modes.
Without experimentation, I think you are taking a leap to say I can do better by rearranging. I will be glad to try your suggestions, but what sounds best is anybody's guess.
I have no idea what your stack sounds like nor your sonic preferences. I'm just commenting on the usual physics of these devices and my own experimentation on my own devices relative to my own preferences.
Yeah, that was quite a slip there! ROTFLMAO
The discs should work fine for the purpose I suggested.
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