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By certification 
SDM-N450 is Polyimide/Titanium 1.75" voice coil diaphragm. It use for RCF N450 compresison driver.
Diaphragm material: Polyimide/Titanium
Voice Coil Diameter:1.75"
Voice Coil Wire Material: CCAR
Bobbin Material: Kapton
Impedance: 8 Ohm
Diaphragm material: Polyimide/Titanium
Voice Coil Diameter:1.75"
Voice Coil Wire Material: CCAR
Bobbin Material: Kapton
Impedance: 8 Ohm
