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Thread: isolation blocks

  1. #21
    Join Date: Sep 2014

    Location: brighton uk.

    Posts: 4,422
    I'm jamie.

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    Quote Originally Posted by JohnG View Post
    I forgot to include in my earlier post, the Sub Plinth was Maple that was supported by a Kiln Dried Sand Bed.
    The sand bed was set up, as a result of working with a CDP Isolation Platform.
    The method incorporated had the most positive effect on the CDP.
    I believe a very fine grade of sand was used, not sharp sand.
    Another way to make a sand bed for a Plinth is to cut open a bicycle inner tube, seal one end, pour in Kiln dried sand, and then seal the open end, this method has been used for to control vibration on Telescopes and Long Telephoto lenses. It will be totally stable, as the moisture level of the sand will be sealed, it will be more user friendly than a bed of sand exposed to the air.
    A really skilled type, where Hifi is concerned might be able to take this method a little further.
    Slit the inner tube carefully, insert a small funnel, add Kiln Dried Sand, reseal the tube with a puncture repair kit.
    Add a little inflation to the tube, or maybe that is taking it a little too far
    thats given me food for thought
    My System
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  2. #22
    Join Date: Nov 2018

    Location: Grimsby

    Posts: 228
    I'm David.

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    Jamie, have you tried bypassing the feet on your tt with wooden cones? I have my PTtoo on 4 wooden cones, sitting on a bamboo board with sorbothane between the board and the hifi stand. I have recently purchased a Technics SL150 and I am going to try 3 stillpoints (only have 3) and don't have any more cones, between the tt and bamboo board. My theory is to get rid of unwanted vibration in the tt, I may be talking nonsense though.

  3. #23
    Join Date: Aug 2008

    Location: Suffolk, UK

    Posts: 1,474
    I'm Paul.

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    I think that either coupling or isolation can work but you have to find the correct way to do it. Unfortunately the calculations are quite difficult and I suspect even if you did them mass distribution across a tt is not usually very uniform, so most people just try different things until they find something that works.

    I cast some silicone blocks and put them under the feet of my Garrard 401 that’s in a slate plinth. They’re soft-ish but not squidgy and they do isolate the tt from vibrations in the unit. Even opening and closing the doors of the unit don’t seem to effect playing at all.
    ~Paul~

  4. #24
    Join Date: Mar 2016

    Location: Brighton, UK.

    Posts: 1,070
    I'm Mike.

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    Just ordered 4 of these, my flat is above a busy restaurant and there is an air conditioner unit on the side of my kitchen/living room wall, this emits some serious and I mean serious vibration.
    Current system. NAS Interspace, Jelco 750, /Nagaoka MP 200/Graham Slee Era V. CDP - Mission PCM 7000. Amps - Quad 909/306/Croft micro 25. Chario Syntar 100 Tower. QED XT40 speaker cable/Straight wire interconnects.

  5. #25
    Join Date: Jan 2009

    Location: Norwich

    Posts: 2,696
    I'm Hugo.

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    Quote Originally Posted by Mikeandvan View Post
    Just ordered 4 of these, my flat is above a busy restaurant and there is an air conditioner unit on the side of my kitchen/living room wall, this emits some serious and I mean serious vibration.
    You should report that to your local council’s Environmental Health department and they should investigate and take action since something is clearly not right. Usually the problem with these things is noise impacting on nearby properties, but if the vibration is that bad, then noise is most likely unacceptable too.

  6. #26
    Join Date: Mar 2016

    Location: Brighton, UK.

    Posts: 1,070
    I'm Mike.

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    Quote Originally Posted by Ammonite Acoustics View Post
    You should report that to your local council’s Environmental Health department and they should investigate and take action since something is clearly not right. Usually the problem with these things is noise impacting on nearby properties, but if the vibration is that bad, then noise is most likely unacceptable too.
    I thought about it, but I doubt there's anything the restaurant is doing that is illegal, mind you I did stuff an old shirt inbetween the extractors fluke and my wall, it helped a lot, another thing now is the smell due to overflowing bins, they'll do anything to save money. The thing with the council is that no immediate action can be taken, you have to keep a 'nuisance' diary and that is a chore in itself!
    Current system. NAS Interspace, Jelco 750, /Nagaoka MP 200/Graham Slee Era V. CDP - Mission PCM 7000. Amps - Quad 909/306/Croft micro 25. Chario Syntar 100 Tower. QED XT40 speaker cable/Straight wire interconnects.

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