5″x 8″ SB15SFCR39-4 / Paper


  • Racetrack design
  • Hard paper cone (made in-house)
  • Optimized motor system
  • Non-conductive reinforced vented coil former
  • Symmetric suspension
  • Low damping rubber surround
  • Long life silver lead wires
  • Vented chassis

Additional information

Nominal Impedance

4 Ω

DC resistance

Re 3.5 Ω

Voice coil inductance

Le 0.88 mH

Effective piston area

Sd 178 cm2

Voice coil diameter

38.5 mm

Voice coil height

17 mm

Air gap height

6 mm

Linear coil travel (p-p)

11 mm

Magnetic flux density

0.94 T

Magnet weight

0.54 kg

Net Weight

1.65 kg

Free air resonance

Fs 31.5 Hz


89.5 dB

Mechanical Q-factor

Qms 7.9

Electrical Q-factor

Qes 0.34

Total Q-factor

Qts 0.33

Moving mass incl. air

Mms 24 g

Force factor

Bl 7.0 Tm

Equivalent volume

Vas 47.8 liters


Cms 1.06 mm/N

Mechanical loss

Rms 0.6 kg/s

Rated power handling

80 W


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


5″x8″ SB15SFCR39-4 Datasheet


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