Specifications :

Spec:
Dome material: Titanium (Gold Titanium )
Voice Coil Diameter: 72.2 mm +/-1.5 mm  
Overall Dimension: 106 mm +/-1.5 mm
Total length: 125 mm+/-2 mm
The distance of  terminals: 39 mm+/-1 mm
Impedance: 8 ohm
DC resistance: 5-8 ohm