8 Ohm Replacement Diaphragm compatible with Altec Compression Drivers - Model: SA-DR10, Contents: Replacement Diaphragm compatible with Altec Compression Drivers, Nominal Impedance: 8 Ohms, Compatible with the following Altec horn/ compression drivers: 288, 291, 299 and 299-AT, Dimensions: Diameter: 4 1/8" | Voice Coil Diameter: 2 7/8", Weight: 0.11 lbs. each, Warranty: One Year Warranty. The SA-DR10 diaphragm replacement kit is an 8 Ohm replacement diaphragm. This replacement diaphragm is made to be compatible with several Altec horns and drivers and sound just as good as the original. These are made just like the original and have matching specifications. The SA-DR10 is for use in Altec horns and drivers and loudspeaker enclosures and is compatible with the following models: 288 291 299 299-AT 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.