Jensen Electric Lightning 70 12"

Nominal Overall Diameter 307 mm 12 in
Nominal Voice Coil Diameter 50 mm 2 in
Magnet Weight 1450 g 51 oz
Overall Weight 4.5 kg 9.92 lbs
Flux Density 1.15 T
Voice Coil Winding Depth 10 mm 0.39 in
Magnetic Gap Depth 8 mm 0.31 in
Thiele-Small Parameters Nominal Impedance 8Ω 16Ω
Voice Coil DC Resistance RE 6.33 Ω 11.94 Ω
Resonance Frequency ƒS 95 Hz 93 Hz
Mechanical Q Factor QMS 14.77 14.5
Electrical Q Factor QES 0.94
Total Q Factor QTS 0.67 0.88
Mechanical Moving Mass MMS 29.9 g 28.3 g
Mechanical Compliance CMS 94 µm/N 103 µm/N
Force Factor BxL 12.7 Wb/m 14.56 Wb/m
Equivalent Acoustic Volume VAS 32 lt. 35.3 lt.
Maximum Linear Displacement XMAX ± 1 mm ± 1 mm
Reference Efficiency nO 3.76 % 2.92 %
Diaphragm Area SD 490.9 cm2 490.9 cm2
Losses Electrical Resistance RES 133.3 Ω 185.7 Ω
Voice Coil Inductance @ 1kHz LE 0.6 mH 0.8 mH
Constructive Characteristics Magnet Ferrite
Voice Coil Winding Aluminum
Voice Coil Former Kapton
Cone Material Paper
Surround Material Integrated Paper
Dust Dome Material Non-treated Cloth
Basket Material Pressed Sheet Steel
Surround Treatment Yes
Electrical Characteristics Nominal Impedance 8Ω 16Ω
Rated Power 70 W 70 W
Musical Power 140 W 140 W
Sensitivity@1W,1m 99 dB 98.1 dB