Specification Sheet - C12R

12" - 25 W Vintage Ceramic Loudspeaker
C12R -
General Characteristics
Nominal Overall Diameter 306 mm 12 in
Nominal Voice Coil Diameter 25 mm 0.98 in
Magnet Weight 270 g 10 oz
Overall Weight 1.4 kg 3.09 lbs
Flux Density 1 T
Voice Coil Winding Depth 8 mm 0.31 in
Magnetic Gap Depth 6 mm 0.24 in
Thiele-Small Parameters
Voice Coil DC Resistance RE 6.7 Ω
Resonance Frequency ƒS 88.3 Hz
Mechanical Q Factor QMS 18.52
Electrical Q Factor QES 2.06
Total Q Factor QTS 2.47
Mechanical Moving Mass MMS 29.5 g
Mechanical Compliance CMS 110 µm/N
Force Factor BxL 6.24 Wb/m
Equivalent Acoustic Volume VAS 37.5 lt.
Maximum Linear Displacement XMAX ±0.8 mm
Reference Efficiency nO 1.2 %
Diaphragm Area SD 490.9 cm2
Losses Electrical Resistance RES 67 Ω
Voice Coil Inductance @ 1kHz LE 0.49 mH
Constructive Characteristics
Magnet Ferrite
Voice Coil Winding Copper
Voice Coil Former Kapton
Cone Material Paper
Surround Material Integrated Paper
Dust Dome Material Felt
Basket Material Pressed Sheet Steel
Surround Treatment No
Electrical Characteristics
Nominal Impedance 8 Ω
Rated Power 25 W
Musical Power 50 W
Sensitivity@1W,1m 92.3 dB
277.0305.5n° 8 holes 9 × 6.5at 45° on Ø 293.52.54.082.6Ø 86.0104.421.85.0