5″ SB13PFCR25-4 / Paper


  • Vented reinforced plastic chassis
  • Proprietary cone material with natural fibres made in-house
  • Soft low damping rubber surround for improved transient response
  • Optimized motor system
  • Vented coil former for low compression
  • Non-resonant long life lead wires
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Additional information

Nominal Impedance

4 Ω

DC resistance

Re 3.2 Ω

Voice coil inductance

Le 0.56 mH

Effective piston area

Sd 87 cm2

Voice coil diameter

25.4 mm

Voice coil height

14 mm

Air gap height

5 mm

Linear coil travel (p-p)

9 mm

Magnetic flux density

1.06 T

Magnet weight

0.36 kg

Net Weight

0.91 kg

Free air resonance

Fs 44 Hz


(2.83 V / 1 m) 89 dB

Mechanical Q-factor

Qms 2.6

Electrical Q-factor

Qes 0.33

Total Q-factor

Qts 0.29

Moving mass incl. air

Mms 10.5 g

Force factor

Bl 5.3 Tm

Equivalent volume

VAS 13.4 liters


Cms 1.25 mm/N

Mechanical loss

Rms 1.1 kg/s

Rated power handling

* 40 W


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



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