Diaphragm Compatible For  B & C DE 12, TBox 12/300, Nexo-ps8, or GEOS 8 - 8 Ohm

Specs: Overall Diaphragm Diameter: 3 3/8" (85.7mm) Voice Coil Diameter:  1 7/16" (36.4mm) Nominal Impedance:  8 ohms