They did sell STAX in the past, if I recall correctly they weren't a big money maker for them and HeadRoom was making a big push for their own balanced dynamic systems. If HeadRoom were to ever make a electrostatic amp it would make sense for them to carry STAX earpeakers or HE Audio. The current STAX brand amps don't live up to the full potential of their earspeakers and it would be hard to compete with Woo Audio, HeadAmp, and Ray Samuels Audio without a statement STAX amp of their own.