... titanium diaphragm 5.Professional loud speaker compression driver designed for HF application6.Hipower Audio is a professinal speaker factory with experience ... speaker field for 8 years. We make our own tranducers ,HF drivers and empty cabinets.7.Details: General Specifications3 Throat Diameter38 ... .3mm 4xM6 holes,90°on 101.6mm diameter H72/8072 HF compression driver