Mackie Speaker Replacement Horn Diaphragm, SRM450, 1701-8, DC10, D-SRM450 Premium SS Audio Diaphragm for several Mackie, EAW, P. Audio, Behringer, Cerwin Vega, Gemini, B-52, and Turbosound models Specs: Impedance: 8 ohm, DCR: 6.5 ohm, Voice coil: 1-3/4" (44mm), Diameter: 2-3/4" (70mm), Length: 4-1/4" (108mm) SUPERIOR quality, LARGEST selection, and the BEST prices! FREE technical support. FAST & FREE shipping to any USA address. To get the BEST quality repair parts, be sure to buy ONLY from SS Audio and Simply Speakers. Thank you!