4″ SB12PFC25-4 / Paper


  • 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

Additional information

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


(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


Cms 1.42 mm/N

Mechanical loss

Rms 0.6 kg/s

Rated power handling

30 W


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



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