Specification Sheet - C8R

8" - 25 W Vintage Ceramic Loudspeaker
C8R -
4Ω /
General Characteristics
Nominal Overall Diameter 207 mm 8 in
Nominal Voice Coil Diameter 25 mm 0.98 in
Magnet Weight 270 g 10 oz
Overall Weight 1 kg 2.2 lbs
Flux Density 1 T
Voice Coil Winding Depth 4 mm 0.16 in
Magnetic Gap Depth 6 mm 0.24 in
Thiele-Small Parameters
Voice Coil DC Resistance RE 3 6.73 Ω
Resonance Frequency ƒS 131 126 Hz
Mechanical Q Factor QMS 9.65 10.29
Total Q Factor QTS 1.42 1.8
Mechanical Moving Mass MMS 9.2 9 g
Mechanical Compliance CMS 161 176 µm/N
Force Factor BxL 3.76 4.7 Wb/m
Equivalent Acoustic Volume VAS 10.3 11.4 lt.
Maximum Linear Displacement XMAX ±1 ±1 mm
Reference Efficiency nO 1.34 1.03 %
Diaphragm Area SD 213.8 213.8 cm2
Losses Electrical Resistance RES 19 37 Ω
Voice Coil Inductance @ 1kHz LE 0.22 0.43 mH
Electrical Q Factor QES 1.67 2.18
Constructive Characteristics
Magnet Ferrite
Voice Coil Winding Copper
Voice Coil Former Kapton
Cone Material Paper
Surround Material Integrated Paper
Dust Dome Material Solid Paper
Basket Material Pressed Sheet Steel
Surround Treatment Yes
Electrical Characteristics
Nominal Impedance 4 8 Ω
Rated Power 25 25 W
Musical Power 50 50 W
Sensitivity@1W,1m 94.4 93 dB
207.0178.55.049.01.0n°4 holes Ø 8 × 5at 90° on Ø 197.022.8Ø 86.06.071.8