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Message: <blockquote data-quote="snb778" data-source="post: 1866771" data-attributes="member: 557170">QUESTION!!!  for those more experienced acoustic guys....OK, you know when you are watching a video of a sub holding out a say....32 Hz note...The video gives the effect that the sub consistently moving in, then slowly out, then slowly in, then slowly out.......I was watching my mirror the other day when I was bumpin a note like that, and you can actually see that vibration in the mirror, like it changes.  Vibrates A LOT, then a little less, THEN A LOT, then a little less....and so on., and you can actually kind of hear it...why does it do this...I will find a vid in a minute if you dont know what im talking about.</blockquote>

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