Arsenal 15" video question

[ultimate157 5,000+ posts]

http://www.realmofexcursion.com/videos/AscendantAudio/arsenal15.1.wmv

I just watched this video, and I have never seen a sub's surround ripple like this. Why is it doing that? Just a video camera recording, or the sub?

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[xluben 10+ year member]

pretty sure it's just the camera