SB Acousitics 21mm Voice coil SB36WBAC21-4

Nominal Impedance

4 

Free air resonance, Fs

200 Hz

DC resistance, Re

3.4 

Sensitivity (2.83 V / 1 m)

77 dB

Voice coil inductance, Le

0.12 mH

Mechanical Q-factor, Qms

0.68

Effective piston area, Sd

4.2 cm2

Electrical Q-factor, Qes

1.05

Voice coil diameter

20.4 mm

Total Q-factor, Qts

0.41

Voice coil height

5.5 mm

Moving mass incl.air, Mms

0.76 g

Air gap height

2.0 mm

Force factor, Bl

1.76 Tm

Linear coil travel (p-p)

3.5 mm

Equivalent volume, Vas

0.021 liters

Magnetic flux density

0.85 T

Compliance, Cms

0.83 mm/N

Magnet weight (NEO)

0.01 kg

Mechanical loss, Rms

1.4 kg/s

Net weight

0.055 kg

Rated power handling*

5 W

*IEC 268-5, high-pass Butterworth, 200 Hz, 12 dB/oct, T/S parameters measured on drive units that are broken in.