SS Audio 4 Pack Mackie Speaker Replacement Horn Diaphragm, SRM450, 1701-8, DC10, D-SRM450 Premium SS Audio 4 pack replacement diaphragm for Mackie, Behringer, Turbosound, Gemini, and many others. Specs: 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!