This is Brand New Original Factory Diaphragm GM-M-34 that fits many D.A.S models. This 8 Ohm diaphragm is an exact fit and replacement for the following D.A.S. Audio Enclosure, Speaker Box or HF Driver: D.A.S : Action 12, 12A, 15, 15A, M12A D.A.S : Artec 506, 508, 526, 506A, 508A, 526A D.A.S : Artec 310.64, 310.96, 312.64, 312.96, 315.64 D.A.S : DR-112, 115, 112A, 115A D.A.S : DR-508, 512, 515, 508A, 512A, 515A D.A.S : M34 Driver Nominal Impedance: 8 ohms