Even the TC Sounds TC2000(a much lower grade driver), in a proper ported or passive radiator cabinet, has no peer when it comes to commercial subwoofers at ANY cost -- not that I know about.
http://www.hometheatershack.com/forums/subwoofer-tests/5758-diy-tc-sounds-tc-2000-15-ported-270l.html
Notice the distortion vs. SPL curves. Incredible. Notice the 110dB distortion trace: 5% THD at 17Hz. At the real-world SPL uses of 90 dB(100dB in a room), that the speaker does not exceed 1 percent THD at 17Hz. Note that in room, this would be about 10dB higher than these 2M groundplane measurements.
That the LMS is considerably superior speaks volumes about TC Sounds' engineering abilities when it comes to woofers.
If these measurements had been available to verify the quality of these drivers when they were still available, I would have purchased 2 of the 15" TC2000 drivers. It's too bad that now you have to pay 2x as much for the drivers under the Audio Pulse label.
-Chris