Maxcast: I don't believe Jim is going to produce the EXT. I heard it in Chicago and it didn't compare to the Seas driver models....Jim has just finished two versions of the HT2 a sealed monitor and a ported floorstander.
This is getting complicated: The speaker he is unlikely to produce (EXT) is offered at the web site, complete with pricing etc. The speaker he is already shipping (HT2) is not mentioned at the web site.
FWIW, Salk has an EXT for sale at Ebay but not here. A QW is offered here. Probably doesn't mean very much, but could be that he thinks more highly of QW than EXT.