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Here's a 6x9 subwoofer from a branded premium car audio system (Harman), playing its guts out ("Going HAM"). It surprised me with the amount of excursion it was capable of, at least 10mm. It has a paper cone with 30% synthetic aramid fibers (similar to Kevlar), 1" coil, foam surround, stamped frame, and a neodymium magnet (the small magnet assembly is as powerful as a large magnet of the ceramic type, while being much smaller and lighter - and more expensive). Not bad at all for an OEM vehicle speaker. The noise you hear is air turbulence noise from the voice coil moving inside the motor structure; normally you could not hear this over the bass output, and it would be isolated on the rear side of the woofer so it would not be emitted into the vehicle cabin. The song is "Long After You're Gone" by Chris Jones. It has an incredible amount of low end. The amplifier is a Dayton Audio APA150 with built-in subwoofer crossover, and the music is also being played through my computer's main speakers (look up my "Neutrino" project).
