คำอธิบาย

Specs
Nominal Impedance 4 Ω
DC resistance, Re 3.1 Ω
Voice coil inductance, Le 0.26 mH
Effective piston area, Sd 50 cm2
Voice coil diameter 25.4 mm
Voice coil height 15 mm
Air gap height 5 mm
Linear coil travel (p-p) 10 mm
Magnetic flux density 0.84 T
Magnet weight 0.32 kg
Net weight 0.7 kg
Free air resonance, Fs 58 Hz
Sensitivity (2.83 V / 1 m) 87.5 dB
Mechanical Q-factor, Qms 3.4
Electrical Q-factor, Qes 0.49
Total Q-factor, Qts 0.43
Moving mass incl. air, Mms 5.3 g
Force factor, Bl 3.5 Tm
Equivalent volume, VAS 5.2 liters
Compliance, Cms 1.42 mm/N
Mechanical loss, Rms 0.6 kg/s
Rated power handling* 30 W
https://sbacoustics.com/product/4-sb12pfcr25-4-paper/