Specification Sheet - Punch BP 12/250

12" - 250 W Bass Speakers Loudspeaker
General Characteristics
Nominal Overall Diameter 318 mm 13 in
Nominal Voice Coil Diameter 65 mm 3 in
Magnet Weight 1450 g 51 oz
Overall Weight 4.8 kg 10.58 lbs
Flux Density 1.15 T
Voice Coil Winding Depth 12 mm 0.47 in
Magnetic Gap Depth 10 mm 0.39 in
Thiele-Small Parameters
Voice Coil DC Resistance RE 6.21 Ω
Resonance Frequency ƒS 50.2 Hz
Mechanical Q Factor QMS 5.14
Electrical Q Factor QES 0.34
Total Q Factor QTS 0.32
Mechanical Moving Mass MMS 46.6 g
Mechanical Compliance CMS 216 µm/N
Force Factor BxL 16.4 Wb/m
Equivalent Acoustic Volume VAS 73.5 lt.
Maximum Linear Displacement XMAX ±3.1 mm
Excursion Limit XVAR ±5.5 mm
Reference Efficiency nO 2.64 %
Diaphragm Area SD 490.9 cm2
Voice Coil Inductance @ 1kHz LE 0.94 mH
Constructive Characteristics
Magnet Ferrite
Voice Coil Winding Copper
Voice Coil Former Kapton
Cone Material Paper
Surround Material Treated Cloth
Dust Dome Material Solid Paper
Basket Material Pressed Sheet Steel
Surround Treatment No
Electrical Characteristics
Nominal Impedance 8 Ω
Rated Power 250 W
Musical Power 500 W
Sensitivity@1W,1m 97.5 dB
Ø318.0n° 8 holes 5x9on Ø300.0Ø285.086.537.08.0Ø154.0123.54.06.3