RE: Constrained-layer Platforms

Posted by Ferrstein (A) on April 19, 2010 at 06:38:18

In Reply to: RE: Constrained-layer Platforms posted by bartc on April 19, 2010 at 06:03:11:

"What it appears you have done (effectively) is to make the sandwiches part of the amp cabinetry by hard screwing them together..."

Thanks for your input. The nuts are just resting under the amps, they are not fastened. They are there to keep the amps off their stock rubber feet. and ensure that vibration borne within the amps make it into the shelves.

"...then using the roller balls to couple them horizontally/rotationally, then using the maple for tuning more than anything."

My thought was that the rollerblocks would not couple the amps to the platforms rotationally or horizontally - they are in fact de-coupling the amps. That's why I chose a "hard foot" - a nut in this case - to couple the amps to the platform. This makes it more likely for vibration modes in the vertical and horizontal plane to make it into the shelf to be dissipated.

"Did you try using the rollers between the amps and the sandwiches first, and skipping the maple altogether? You might want to do that. It's the more commonly effective approach."

Now, I haven't tried that, mostly because the bottoms of the amps are quite flexible. The amps are heavyish at about 50 lbs. The bottom is .1" steel. I could perhaps try your suggestion by inverting the rollerblocks so their bases are on the amps and the ball is beneath. Hmmm... or I could try the maple under the amps. Lots of options to be sure!

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Follow Ups Full Thread

Topic - Constrained-layer Platforms - Ferrstein 05:45:10 04/19/10 (28)

DANG! - dogwan 20:54:22 04/21/10 (4)

RE: DANG! - hella356 11:06:07 04/28/10 (2)

RE: DANG! - dogwan 23:36:55 04/28/10 (1)

RE: DANG! - hella356 09:45:43 04/29/10 (0)

RE: DANG! - Ferrstein 02:08:36 04/22/10 (0)

RE: Constrained-layer Platforms - benie 16:19:46 04/20/10 (6)

RE: Constrained-layer Platforms - Ferrstein 16:30:54 04/20/10 (5)

RE: Constrained-layer Platforms - benie 21:05:20 04/20/10 (4)

RE: Constrained-layer Platforms - Ferrstein 18:56:13 04/21/10 (1)

RE: Constrained-layer Platforms - benie 00:31:03 04/22/10 (0)

RE: Constrained-layer Platforms - Ferrstein 02:41:55 04/21/10 (1)

RE: Constrained-layer Platforms - benie 16:44:18 04/21/10 (0)

RE: Constrained-layer Platforms - vital ital 15:03:09 04/20/10 (1)

Shakey Shelf - Ferrstein 16:33:09 04/20/10 (0)

RE: Constrained-layer Platforms - Jack G 04:43:05 04/20/10 (0)

RE: Constrained-layer Platforms - bartc 06:03:11 04/19/10 (8)

RE: Constrained-layer Platforms - Ferrstein 06:38:18 04/19/10 (7)

Then you're not optimized by a longshot yet - bartc 06:47:43 04/19/10 (6)

RE: Then you're not optimized by a longshot yet - Ferrstein 07:30:46 04/19/10 (5)

I agree with you - dave c 14:34:03 04/19/10 (3)

RE: I agree with you - bartc 19:04:07 04/19/10 (2)

RE: I agree with you - Ferrstein 03:19:17 04/20/10 (1)

And I agree you need to experiment. - bartc 05:59:42 04/20/10 (0)

Your nuts and optimization LOL - bartc 07:56:40 04/19/10 (0)

Rollerblock Jrs Below - Ferrstein 05:47:13 04/19/10 (3)

Shelf Detail - Ferrstein 05:49:21 04/19/10 (2)

A good simple easy to make design - dave c 14:38:11 04/19/10 (1)

RE: A good simple easy to make design - Ferrstein 03:15:59 04/20/10 (0)

Follow Ups

RE: Constrained-layer Platforms - Ferrstein 06:38:18 04/19/10 (7)

Then you're not optimized by a longshot yet - bartc 06:47:43 04/19/10 (6)

RE: Then you're not optimized by a longshot yet - Ferrstein 07:30:46 04/19/10 (5)

I agree with you - dave c 14:34:03 04/19/10 (3)

RE: I agree with you - bartc 19:04:07 04/19/10 (2)

RE: I agree with you - Ferrstein 03:19:17 04/20/10 (1)

And I agree you need to experiment. - bartc 05:59:42 04/20/10 (0)

Your nuts and optimization LOL - bartc 07:56:40 04/19/10 (0)

RE: Constrained-layer Platforms

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