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Message: <blockquote data-quote="DFW40" data-source="post: 551113" data-attributes="member: 556468">Good point. So lets go back to the original question, does the air moved make the spl or the power going in? I think that it is the air moved and watts are just a way to get the air going.So if a cone moved back and forth 40 times in a second it would be a 40 hz. wave.The time frame to determine a freq is one second? So if you played a 40 hz wave consistently over three seconds the cone will have gone back and forth 120 times.</blockquote>

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