This Is A Brand New Aftermarket Replacement Diaphragm 8 ohm For Samson CD44T Compression Driver Overall Diaphragm Diameter: 2 15/16" (74mm) Voice Coil Diameter: 1 3/4" (44.4mm) Mounting Holes: 2 1/4" (57mm) Center To Center Nominal Impedance: 8 ohms