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A new kind of woofer.(Bruce Thigpen )(Interview)
Most of us know how dynamic woofers work. A voice coil working within a magnetic field is excited by the AC voltage applied by an audio amplifier. The voice coil moves back and forth within the field at the input frequency, and attached to the outer rim of that coil is a cone-shaped diaphragm that is secured at its apex near the coil junction by a spider and at its outer edge by a flexible surround. As the cone moves back and forth it generates sound, due to its interaction with the air in front of it. There are variations on this arrangement, of course, but those are the basics.
So, what are the disadvantages of dynamically driven cone woofers? Well, other than ...
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Source: HighBeam Research, A new kind of woofer.(Bruce Thigpen )(Interview)