SB Acoustics 4" mid/woofer, 25mm VC PFC, Round Basket , SB12PFCR25-8 25mm

Nominal Impedance

8 

Free air resonance, Fs

64 Hz

DC resistance, Re

6.4 

Sensitivity (2.83 V / 1 m)

84.5 dB

Voice coil inductance, Le

0.36 mH

Mechanical Q-factor, Qms

4.10

Effective piston area, Sd

50 cm2

Electrical Q-factor, Qes

0.65

Voice coil diameter

25.4 mm

Total Q-factor, Qts

0.56

Voice coil height

15 mm

Moving mass incl.air, Mms

5.1 g

Air gap height

5 mm

Force factor, Bl

4.5 Tm

Linear coil travel (p-p)

10 mm

Equivalent volume, Vas

4.3 liters

Magnetic flux density

0.84 T

Compliance, Cms

1.21 mm/N

Magnet weight

0.32 kg

Mechanical loss, Rms

0.5 kg/s

Net weight

0.7 kg

Rated power handling*

30 W

IEC 268-5, T/S parameters measured on drive units that are broken in.