On March 29, 2009 Ray introduced the A-10 Thunderbolt II to Head-Fi. The 1st post of the earlier link describes Ray's design for the A-10 Thunderbolt II. Since then, Ray has continued to improve the A-10 as even the early A-10 had some of the same electrostatic restrictions as other similar electrostatic amplifiers. It had the speed and clarity but in my opinion they all still lack really natural sub-bass and bass and just left you wanting. As I looked back through that thread, I saw I was extremely excited about the A-10 but found myself hesitant...