SB Acoustics SB12NRX25-8 4″ woofer- PAIR new, tested

Description

SB Acoustics NRX-8, new tested PAIR, in original boxes.
Nominal Impedance 8 Ω
DC resistance, Re 6.4 Ω
Voice coil inductance, Le 0.34 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 1.07 T
Magnet weight 0.40 kg
Net weight 0.92 kg
Free air resonance, Fs 57 Hz
Sensitivity (2.83 V / 1 m) 85.5 dB
Mechanical Q-factor, Qms 4.1
Electrical Q-factor, Qes 0.41
Total Q-factor, Qts 0.37
Moving mass incl. air, Mms 5.2 g
Force factor, Bl 5.4 Tm
Equivalent volume, VAS 5.3 liters
Compliance, Cms 1.49 mm/N
Mechanical loss, Rms 0.45 kg/s
Rated power handling* 30 W