Adapter titanium compression driver has been designed to meet the requirements set forth by LucasFilm for THX approval.The 44XT meets all THX requirements and may be used for all THX installations. It is a high performance, high power compression driver with a smoother and extended high frequency response. It consists of our newly developed Radialinear phase plug (patented), one-piece titanium diaphragm and ferrofluid. High frequency extension is achieved by focusing the acoustical energy of the diaphragm to a central point within the throat of the horn. By focusing the acoustical energy we can reduce the amount of high frequency cancellations and diffraction that is present in most other phase plug designs.