I took an HGS-10 to Velodyne some years ago when I was in Monterey for the car weekend. I got the impression that subs were just a sideline activity of a tech company that saw a good application for its high-gain servo technology. I have two HGS-15s, four HGS-10s, and two SMS-1 bass managers. At the time, SRI had a similar project aimed at sound cancellation.
