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This is a high quality aftermarket JBL diaphragm that fits many JBL models JBL SRX-725. It has an edgewound aluminum ribbon voice coil (DCR 6.0 ohms) and the dome is titanium. This Diaphragm Fits JBL 2446, 2446H, 2447, 2447H, 2450, 2450H, 2451, 2451H, 2451SLH, 2452, 2452H driver / horn. This is a direct replacement for the JBL part number D8R2550 and D8R2451SLH. Overall Diaphragm Diameter: 5" (127mm) Voice Coil Diameter: 3.91" (127mm) Diaphragm Thickness:0.05mm Diaphragm Height:18.4mm Nominal Impedance: 8 ohms Most Orders Placed Before 3PM and Paid thru' PayPal Are Shipped The Same Day; Monday to Friday