4PCS diaphragm high quality which is use for following models: SPECIFICATION: Overall Diaphragm Diameter:  2.75" Voice Coil Diameter:  1.75" with titanium dome. Impedance:  8 ohms. DCR is 6.5 ohms. Mackie: 1701-8, 17018, CD10-1701-8, CD10-1701, DC10-1701, DC10/1701-8, DC-10-1701, CD10/1701-8, SRM450, SRM-450, SRM 450, C300Z, C-300Z, C 300Z, SA-1521, SA1521, SA 1521, SR-1522, SR1522, SR 1522, 0025666, 0008093, 77005-014, S-215, S215 S 215, S-225, S225, S 225 Berhinger: 44P60A8, 44P60-A8, 44-P60A8, 44P60A-8; P-Audio 440, BMD-440, BMD 440; P-Audio 450, BMD-450, BMD 450; P-Audio Co-Ax BM10 CXA, BM10-CXA, BM10CXA; P-Audio Co-Ax BM12 CXA, BM12-CXA, BM12CXA; P-Audio Co-Ax BM12 CXHA, BM12-CXHA, BM12CXHA; P-Audio Co-Ax BM15 CXA, BM15-CXA, BM15CXA; P-Audio Co-Ax BM15 CXHA, BM15-CXHA, BM15CXHA; Gemini GX400, GX-400, GX 400Mackie: DC10/1701-8, SRM-450 version 1, C300Z, 0008093, 0025666, SA-1521(will not fit the SA-1521Z), SR-1522, SR-1522Z, S-215, S-225, S408 Turbosound: RD111, RD-111, RD 111, RD-111-8, 111; Turbosound CD111, CD-111, CD 111, CD-111-8, 111-8; Turbosound TXD121, TXD-121, TXD 121, TXD-121-8; Turbosound TXD12M, TXD-12M, TXD 12M, TXD-12M-8; Turbosound TXD151, TXD-151, TXD 151, TXD-151-8 P-Audio: BMD-440, BMD-450 SPECIFICATION: Overall Diaphragm Diameter:  2.75" Voice Coil Diameter:  1.75" with titanium dome. Impedance:  8 ohms. DCR is 6.5 ohms. Our Products are 100%  Quality Guaranteed or you money back!