[img]http://img822.**************/img822/7775/d5closeup.png[/img]
OK, the woofer cone inside edge is glued to the tube. The woofer and the tube move together as an assembly.
My speculation is that the tube edge is contacting the waveguide. I can't get calipers in there to measure though. It looks like the wave guide bulges out a little, but I don't know. This is the type of speculation for which the internet is infamous, but so be it. 99% chance I'm wrong, regardless, the noise is there well below 102 dB.
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