Replacement Diaphragm for Gauss Driver 4080. HF4000, DK4080 Aluminium Dome 16 Ω. This is a high quality aftermarket Gauss diaphragm that fits many Gauss Driver. It has an edgewound aluminum ribbon voice coil and the dome is Aluminium. Our diaphragm is rated for the same amount of power and sounds just like the original HF-4000 diaphragm. Specifications : Overall Diaphragm Diameter: 5.41 (143mm) Diaphragm Material : Aluminium Voice Coil Diameter: 4.125" (104.7mm) Nominal Impedance: 16 Ω