Specification Sheet - C12K

12" - 100 W Vintage Ceramic Loudspeaker
C12K -
4Ω /
8Ω /
16Ω
General Characteristics
Nominal Overall Diameter 307 mm 12 in
Nominal Voice Coil Diameter 50 mm 2 in
Magnet Weight 1450 g 51 oz
Overall Weight 4.3 kg 9.48 lbs
Flux Density 1.1 T
Voice Coil Winding Depth 10 mm 0.39 in
Magnetic Gap Depth 8 mm 0.31 in
Thiele-Small Parameters
16Ω
Voice Coil DC Resistance RE 3.25 6.75 12 Ω
Resonance Frequency ƒS 102 115 107 Hz
Mechanical Q Factor QMS 19.8 16.4 22.37
Total Q Factor QTS 0.52 0.82 0.75
Mechanical Moving Mass MMS 34.9 33.4 29.3 g
Mechanical Compliance CMS 70 57 77 µm/N
Force Factor BxL 11.65 13.7 17.7 Wb/m
Equivalent Acoustic Volume VAS 23.6 19.6 26 lt.
Maximum Linear Displacement XMAX ±1 ±1 ±1 mm
Reference Efficiency nO 4.47 4.43 3.89 %
Diaphragm Area SD 490.9 490.9 490.9 cm2
Losses Electrical Resistance RES 120 210 360 Ω
Voice Coil Inductance @ 1kHz LE 0.61 0.84 1.36 mH
Electrical Q Factor QES 0.53 0.86 0.78
Constructive Characteristics
Magnet Ferrite
Voice Coil Winding Copper
Voice Coil Former Kapton
Cone Material Paper
Surround Material Integrated Paper
Dust Dome Material Non-treated Cloth
Basket Material Pressed Sheet Steel
Surround Treatment Yes
Electrical Characteristics
16Ω
Nominal Impedance 4 8 16 Ω
Rated Power 100 100 100 W
Musical Power 200 200 200 W
Sensitivity@1W,1m 99.4 99 99 dB
Product Dimensions
C12K angled view
C12K bottom view
C12K side view
C12K top view