There are more companies that supported HTF. Chad from Epik Subwoofers was a frequent poster here back when he ran Ascendant Audio. There are a few guys from Hsu Research here. Danny from GR Research is active at other forums as well as Mark from Seaton Sound. If you want a sub from a...
Tom V is no longer with the company. Ron S plays an "important role" according to the new owner if you do a little Google searching.
Tom's new company - http://www.powersoundaudio.com/pages/team