Specification Sheet - Punch BP 15/250

15" - 250 W Bass Speakers Loudspeaker
General Characteristics
Nominal Overall Diameter 385 mm 15 in
Nominal Voice Coil Diameter 65 mm 3 in
Magnet Weight 1450 g 51 oz
Overall Weight 5.4 kg 11.9 lbs
Flux Density 1.15 T
Voice Coil Winding Depth 13 mm 0.51 in
Magnetic Gap Depth 8 mm 0.31 in
Thiele-Small Parameters
Voice Coil DC Resistance RE 6.6 Ω
Resonance Frequency ƒS 47 Hz
Mechanical Q Factor QMS 4.26
Electrical Q Factor QES 0.57
Total Q Factor QTS 0.51
Mechanical Moving Mass MMS 69.7 g
Mechanical Compliance CMS 164 µm/N
Force Factor BxL 15.31 Wb/m
Equivalent Acoustic Volume VAS 133.1 lt.
Maximum Linear Displacement XMAX ±3.4 mm
Excursion Limit XVAR ±7 mm
Reference Efficiency nO 2.3 %
Diaphragm Area SD 754.8 cm2
Voice Coil Inductance @ 1kHz LE 1.07 mH
Constructive Characteristics
Magnet Ferrite
Voice Coil Winding Copper
Voice Coil Former Aluminum
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 96.7 dB
Ø383.0n° 8 holes 6x9on Ø372.0Ø358.0107.037.08.0Ø154.0144.04.06.5