Well, it just looks generally weird to me - very deep straight basket, the magnet place so high, up into the spokes, the suspension in the back - I'm sorry if I implied it's something truly unique, but it does seem rather different from the run-of-the-mill.
My guees is that there are two spiders - one on each end of the voice coil. This allows for a much tighter gap and better BL for a given motor structure. It probably has long excursion.
The downside to this kind of design is a lot of mass in the Voice coil. This creates an extremely limited bandwidth - OK in a subwoofer, a disaster in anything else.
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