This Is A Brand New Aftermarket Diaphragm Replacement for B&C DE600, DE610, DE620, D-BCMMD600-8, Martin F15 DCD-14002 Please Look And Make Sure The Diaphragm You Are Ordering Matches The Pictures Above & The Specs Below Voice Coil Diameter : 66mm, 2.59" Impedance : 8 Ohm Outer Ring Diameter : 89mm, 3.50" The Center Distance Of The Two Post Terminals : ~101.9mm