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I don't doubt it can be done for around $2k, but it won't be with a traditional woofer design. Cones have greater and greater trouble coupling with the air they are trying to move as the wavelength of the tone they are attempting to reproduce exceeds their diameter*. Adding more cones doesn't help with this mismatch so much either. That just allows the little bit of interface between the air and cone to be multiplied, which is geometrical what is needed is exponential.

* A 12" woofer has an "impedance match" with the air when producing a 1kHz tone.**

** Of course getting a 12" woofer to cycle 1000 times in a second is another matter.