Tweakers' Asylum

Re: Home-brew isolation base

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clio09

(A)

In Reply to: Home-brew isolation base posted by Ted Smith on January 15, 2007 at 21:28:28:

I use the HRS damping plates with good results, especially on top of my speakers. I have always been intrigued by the couplers. However, in your configuration I would think the granite would impart some ringing. Do the couplers negate this effect. If so, you have a very inexpensive version of the HRS base.
BTW - I was told by someone that the non-metal material used with the plates is 40 durometer rubber. Seems like this could be easily purchased at places like McMaster-Carr. Perhaps attaching the rubber to a heavier mass item like stone, lead, or brass might impart the same effect as the plates.

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I was wondering if anyone was going to reply :) - Ted Smith 08:16:36 01/17/07 (3)
Howdy
Thanks for bringing up the ringing: The knuckle rap test shows the same ringing (well the pitch changes inversely with slab size) in the marble vs. the M3 isolation bases. The volume and character of the sound is essentially identical so I don't think I'm less damped than the M3 bases.
I thought about using more Couplers between the granite and the supported items, but since that's not the way I used the M3s I chose the cheaper way out for now. Thanks for the reminder about the Nimbus like material. I've been pleased with the Nimbus pucks in the past and got a good buy on a bunch of them several years ago so they were the natural thing to try.
I have a friend coming over and if we can find the time perhaps we'll do some A/Bing. So far I don't detect any downsides, in fact I find that I'm listening more which is always a good sign. Since I moved amps from M3s on plywood to home brew on stands I'm not attributing anything solely to the changes in isolation bases.
-Ted
- Re: I was wondering if anyone was going to reply :) - clio09 11:30:26 01/17/07 (2)
  Interesting and may be worth looking into. My amp is on a Sistrum amp stand and it is working fine. However, I have two of these Adona granite/MDF platforms I used to use on an old rack of mine in lieu of the stock shelves. I was thinking of using these to make my own Prometheus base ala Machina Dynamica for a couple of new components I have, but so far haven't found a source for viseo elastic damped springs. I'm sure someone out there has them, I just haven't had time to look thoroughly.
  So, based on your post I thought I could use the nimbus devices, but in an effort to really save some money maybe use hockey pucks or the Blue Circle foam pucks. I could use cones on the bottom of one of the platforms to couple it to the floor, then the pucks or nimbus devices, and then the top shelf sitting on those. I would most likely isolate the component from the top shelf as well.
  Nonthe less, you've given me some good ideas...
  - Good luck - Ted Smith 11:37:06 01/17/07 (1)
    Howdy
    Also we really like the look of the slabs, it sort of adds a little character to the utilitarian look of the older SimAudio gear :)
    It's still fun to just try a few things out...
    -Ted
    - You'd dig the MD Promethean Base... - Wellfed 22:11:04 01/17/07 (0)
      Be sure and get some Codename Turquoise while you're at it. If you only try one Machina Dynamica product all year...
      Machina Dynamica Codename Turquoise (Open in New Window)

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