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<blockquote data-quote="keep_hope_alive" data-source="post: 7853320" data-attributes="member: 576029">your test was quite flawed... you mostly measured barrier effects and transmission loss. a dB meter is not acceptable for that test as you cannot resolve the amplitude of each frequency being tested.&nbsp; to truly evaluate deadener you need accelerometers or the ability to measure resonance frequency of materials with a narrow band RTA (our narrow band measurements have 1Hz resolution).&nbsp; having the mic in a fixed position means you were also measuring room modes and phase interference that would not be noticeable with a dB meter.&nbsp; nothing in that test allows you to evaluate the elastomeric and viscoelastic properties of deadener.&nbsp;&nbsp; your judges knew nothing about acoustics... i would have given you an &quot;F&quot;.&nbsp; //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gifscience fairs aren&#039;t about science, they are about self-marketing and speaking skills.</blockquote>

[QUOTE="keep_hope_alive, post: 7853320, member: 576029"] your test was quite flawed... you mostly measured barrier effects and transmission loss. a dB meter is not acceptable for that test as you cannot resolve the amplitude of each frequency being tested. to truly evaluate deadener you need accelerometers or the ability to measure resonance frequency of materials with a narrow band RTA (our narrow band measurements have 1Hz resolution). having the mic in a fixed position means you were also measuring room modes and phase interference that would not be noticeable with a dB meter. nothing in that test allows you to evaluate the elastomeric and viscoelastic properties of deadener. your judges knew nothing about acoustics... i would have given you an "F". [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] science fairs aren't about science, they are about self-marketing and speaking skills. [/QUOTE]

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