Roofing Cement Extensional Damping Compound

Discussion in 'Archived Threads 2001-2004' started by Travis G, Feb 21, 2003.

  1. Travis G

    Travis G Stunt Coordinator

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    I was planning on using a roofing cement and sand mixture as an extensional damping compound on some loudspeakers that I am building. I just realized that the stuff I bought is solvent based, and I know that both Weems and Dickason have warned against using solvent based products on loudspeaker enclosures. I am confused because Dickason was the one that sugggested it. Did I get the wrong stuff?

    Weems said that solvent based products never fully dry out, and that the solvent fumes can soften the spiders and eat the adhesives that drivers are made with. Dickason said something to the same effect.

    I would appreciate the advice of anyone who has used extensional damping compounds.

    Thanks,

    Travis
     
  2. Brett DiMichele

    Brett DiMichele Producer

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    Travis,

    Good question.... When I do my speakers I wanted to mix a
    batch of cheap latex paint and SkimCrete together into a
    semi thick latex concrete mixture for sound deadening and
    sealing purposes. I was afraid that the water content in
    the latex would cause problems with the MDF...

    Any ideas?
     
  3. ThomasW

    ThomasW Cinematographer

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    I suggest you use a product like Kool-Seal. It won't harm the drivers.

    Use a primer coat of just the sealer. Then apply multiple coats of the sealer mixed with sand. Finally top coat again just the pure sealer.

    Note, all this does is add mass (same as using thicker walls)
     

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