This is a Circuit Shop Audio diaphragm made to Eminence specs. This diaphragm fits many Yamaha, Carvin and Sonic drivers as well as Eminence PSD2002-8, PSD2002S-8, MD2001-8 and MD2001-8 drivers. It is a direct replacement for Eminence part number PSD2002-8DIA. Specs: Overall diameter - 3.57" * Voice Coil Diameter - 2.01" * DCR - 6.6 ohm * Impedance - 8 ohm. Circuit Shop Audio diaphragms are gaurenteed to fit perfectly and sound just like the original. Dont settle for cheap "aftermarket" diaphragms.