Tweakers' Asylum

• RE: Adding mass shifts the resonant frequency. - Patster 20:08:41 10/10/08 (3)
  In Reply to: RE: Adding mass shifts the resonant frequency. posted by Al Sekela on October 10, 2008 at 16:42:45

  Thanks Al Sekala
  I currently have a 8lb weight resting on a blue circle puc
  One for each amp
  
  The input transformers I have a 3 pound dumbell donut with hole inside
  Inside the hole I have a herbie tenderfoot
  
  What you want is a heavy but non-resonant object together with a layer of damping material. "Damping" refers to the property of converting vibrational energy into heat
  Al Does this fit the application you mentioned above
  
  

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  • Depends on whether the Herbie's Tenderfoot - Al Sekela 12:27:11 10/11/08 (2)
    In Reply to: RE: Adding mass shifts the resonant frequency. posted by Patster on October 10, 2008 at 20:08:41

    is loaded to within its design pressure range. It is made to convert vibrational energy into heat, but will only do so if the weight on it is within its specified range. If you overload it, it won't dissipate vibration. See the Herbie's site for the weight ranges intended for the various footers.
    
    I'm not sure what you mean by "blue circle puc." AFAIK, the Blue Circle Audio Puck is a specialized capacitor used in their power supply upgrades, and not a damping device.
    
    What I would do is order a sheet of Deflex rubber and cut pieces to fit under the weights you intend to use. I would look for weights made of material that does not ring with a definable tone when tapped. Iron weights would definitely ring and create more trouble for damping. However, steel shot in wooden boxes would be less lively and give you magnetic behavior similar to the solid iron. Mix the steel shot with quartz sand for even less acoustic vibration.
    
    

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    • RE: Depends on whether the Herbie's Tenderfoot - Patster 17:33:35 10/11/08 (1)
      In Reply to: RE: Depends on whether the Herbie's Tenderfoot posted by Al Sekela on October 11, 2008 at 12:27:11

      Thanks Al
      
      Here's a bit of info on the tenderfeet
      Recommended for audio and video components weighing from 2 to 50 pounds (1-23kg). Particularly well-suited for CD/DVD and SACD players, DACs, preamps, power supplies and conditioners, turntables, and small amplifiers. Delivers a full-bodied and quick, highly articulate result with amazing linear extension.
      
      The blue circle pucks i'm referring to our made out of foam and are shaped like a hockey puck the weight sit's on top of the foam
      
      I checked for the deflex rubber there are many types which one do you recommend
      
      

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      • I'd use one of the thinner sheets. - Al Sekela 12:28:15 10/12/08 (0)
        In Reply to: RE: Depends on whether the Herbie's Tenderfoot posted by Patster on October 11, 2008 at 17:33:35

        The thick Deflex will have a lot of give to it, and may not prevent your weight from wobbling on top of the amp.
        
        For your existing combinations, simply try pressing gently on them. If there is a little give to the damping material, then you are likely getting some benefit from it. If the damping material is squashed by the weight and does not give at all, then the material is likely overloaded and cannot absorb energy.
        
        

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