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Message: <blockquote data-quote="ciaonzo" data-source="post: 6810982" data-attributes="member: 607015"><p>I'm trying to remember what company it was that used this approach. It was a huge servo-driven subwoofer with two 15" cones in a face-to-face configuration which was used for outdoor venues. Anyway, the DC servo motor was huge and created gobs of heat so they had to fan cool it so it didn't die during the concerts.</p></blockquote><p></p>

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