All the drivers on their page had specs except for the sub one.
Well the plot has thickened!
This outfit have done a lot of tease advertising over the last few months. They were showing potentially interesting product.
http://www.hempacoustics.com/products.php
I have had correspondence with them as recently as March 27. They had published no specs. All of a sudden there are specs on their site, sooner than even they said they would be available.
They also recently announced, now off their website, but on it recently, that the partners had fallen out.
My suspicion is that this is the result of the fall out.
http://www.hemptonespeakers.com/
Under the circumstances I would be suspicious of the specs from both outfits, until verification.
I have just realized this morning that there are now two outfits in the hemp speaker business. I thought the OP was referring to the original outfit in my bookmarks. These two companies I think are born out of the fallout.