5″ SB15MFC30-8 / Polypropylene


  • Vented cast aluminium chassis for optimum strength and low compression
  • Mineral filled PP-cone made in-house
  • Soft low damping rubber surround for improved transient response
  • Non-conducting fibre glass voice coil former for minimum damping
  • Extended copper sleeve on pole piece for low inductance and low distortion
  • CCAW voice coil for reduced moving mass
  • Long life silver lead wires
  • Vented pole piece for reduced compression
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Additional information

Nominal Impedance

8 Ω

DC resistance

Re 5.7 Ω

Voice coil inductance

Le 0.14 mH

Effective piston area

Sd 82 cm2

Voice coil diameter

30.5 mm

Voice coil height

15 mm

Air gap height

5 mm

Linear coil travel (p-p)

10 mm

Magnetic flux density

1.0 T

Magnet weight

0.54 kg

Net Weight

1.48 kg

Free air resonance

Fs 39 Hz


(2.83 V / 1 m) 87 dB

Mechanical Q-factor

Qms 4.4

Electrical Q-factor

Qes 0.4

Total Q-factor

Qts 0.37

Moving mass incl. air

Mms 9.0 g

Force factor

Bl 5.6 Tm

Equivalent volume

VAS 17.7 liters


Cms 1.85 mm/N

Mechanical loss

Rms 0.5 kg/s

Rated power handling

* 50 W


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



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