คำอธิบาย

4″ SB12PFCR25-8 /  Paper 8 ohm
 
Features
Vented reinforced plastic chassis
Proprietary cone material with natural fibers made in-house
Butyl rubber surround for smooth frequency response
Vented motor system for low compression
Long stroke linear suspension for improved dynamics
Non-resonant long life lead wires
 
Specs
Nominal Impedance 8 Ω
DC resistance, Re 6.4 Ω
Voice coil inductance, Le 0.36 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 64 Hz
Sensitivity (2.83 V / 1 m) 84.5 dB
Mechanical Q-factor, Qms 4.10
Electrical Q-factor, Qes 0.65
Total Q-factor, Qts 0.56
Moving mass incl. air, Mms 5.1 g
Force factor, Bl 4.5 Tm
Equivalent volume, VAS 4.3 liters
Compliance, Cms 1.21 mm/N
Mechanical loss, Rms 0.5 kg/s
Rated power handling* 30 W
 
https://sbacoustics.com/wp-content/uploads/2020/02/4in-SB12PFCR25-8.pdf