Replacement Diaphragm for Selenium D250-X horn driver - Model: SA-DR9, Contents: Replacement Diaphragm for Selenium D250-X horn driver, Nominal Impedance: 8 Ohms, Compatible with Selenium D250-X horn drivers, Dimensions: Diameter: 4 Inches | Voice Coil Diameter: 2", Weight: 0.04 lbs. each, Warranty: One Year Warranty. The SA-DR9 diaphragm replacement kit is a 8 Ohm diaphragm. This replacement diaphragm is made to be compatible with the Selenium D250-X Horn Driver and sound just as good as the original. These are made just like the original and have matching specifications. The SA-DR9 is for use as a replacement diaphragm for the Selenium D250-X Horn Driver. Never be without the parts you need to keep the music going! Order replacement diaphragms from Seismic Audio and make us your one stop shop for all your Pro Audio loudspeaker needs.