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  1. snowrat

    engine noise

    Maybe I should suggest turning it off to the ceo. Actually, it must run all the time. Its demand cannot wait for a sound control system to turn off. At anyrate, quiet would be if outside in an open field if a person stands more than 50 feet from it they should not be able to hear it.
  2. snowrat

    engine noise

    I need to quiet an 18HP 2cycle engine significantly. Significantly, means allot of effort is justifiable to make it completley inaudible.
  3. snowrat

    Active Silencer/Muffler Design

    You will want to check out Leuven University. http://www.mech.kuleuven.ac.be/pma/research/mod/topics/topic03/default_en.phtml Papers from Sas R. Boonen are quite good
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