Specification Sheet - Punch BP 8/150

8" - 150 W Bass Speakers Loudspeaker
General Characteristics
Nominal Overall Diameter 209 mm 8 in
Nominal Voice Coil Diameter 50 mm 2 in
Magnet Weight 1100 g 39 oz
Overall Weight 3.1 kg 6.83 lbs
Flux Density 1.1 T
Voice Coil Winding Depth 11 mm 0.43 in
Magnetic Gap Depth 10 mm 0.39 in
Thiele-Small Parameters
Voice Coil DC Resistance RE 6.08 Ω
Resonance Frequency ƒS 74.7 Hz
Mechanical Q Factor QMS 3.61
Electrical Q Factor QES 0.36
Total Q Factor QTS 0.33
Mechanical Moving Mass MMS 22.4 g
Mechanical Compliance CMS 203 µm/N
Force Factor BxL 13.29 Wb/m
Equivalent Acoustic Volume VAS 13.1 lt.
Maximum Linear Displacement XMAX ±3.1 mm
Excursion Limit XVAR ±6.6 mm
Reference Efficiency nO 1.45 %
Diaphragm Area SD 213.8 cm2
Voice Coil Inductance @ 1kHz LE 0.71 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 150 W
Musical Power 300 W
Sensitivity@1W,1m 95 dB
52.587.535.0Ø134.08.05.53.0179.5210.0n° 4 holes Ø4.5at 90° on Ø198.5