Specification Sheet - P12R

12" - 25 W Vintage Alnico Loudspeaker
P12R -
8Ω /
16Ω
General Characteristics
Nominal Overall Diameter 307 mm 12 in
Nominal Voice Coil Diameter 25 mm 0.98 in
Magnet Weight 200 g 7 oz
Overall Weight 1.5 kg 3.31 lbs
Flux Density 0.96 T
Voice Coil Winding Depth 8 mm 0.31 in
Magnetic Gap Depth 6 mm 0.24 in
Thiele-Small Parameters
16Ω
Voice Coil DC Resistance RE 6.05 12 Ω
Resonance Frequency ƒS 80 77 Hz
Mechanical Q Factor QMS 13.07 12.53
Total Q Factor QTS 2.1 2.2
Mechanical Moving Mass MMS 25.2 19.9 g
Mechanical Compliance CMS 157 214 µm/N
Force Factor BxL 5.53 6.68 Wb/m
Equivalent Acoustic Volume VAS 54 72.6 lt.
Maximum Linear Displacement XMAX ±1 ±0.75 mm
Reference Efficiency nO 1.56 1.19 %
Diaphragm Area SD 490.9 490.8 cm2
Losses Electrical Resistance RES 39 58 Ω
Voice Coil Inductance @ 1kHz LE 0.5 0.84 mH
Electrical Q Factor QES 2.50 2.67
Constructive Characteristics
Magnet Alnico
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 No
Electrical Characteristics
16Ω
Nominal Impedance 8 16 Ω
Rated Power 25 25 W
Musical Power 50 50 W
Sensitivity@1W,1m 93.7 94 dB
305.5277.04.02.5132.16.082.649.5n°8 holes 9×6.5at 45° on Ø298.5