If so check out this new company:
No affiliation. This is a new company that has licensed the XBL^2 motor tech from Adire Audio. They have some really cool new drivers that are much cheaper than the other XBL2 drivers. They also do their own engineering.
If I could afford one, I would get this Avalanche 18. 27mm of one way Xmax and huge Sd. hubba hubba
There are more flat BL drivers coming out from Stryke Audio (Acoustic Elegance) and *maybe* TC Sounds (supplier of some SVS woofs) and there will probably be more news of uber woofers next week during CES.
It's a good time for DIYers.
Edit: added the maybe before TC, the developer of their LMT technology has apparently left the company. I personally dont like the idea of LMT anyway, it doesn't look like anything new. The VC is huge and it needs dual spiders. Maybe AE will have a better approach.