4″ SB12PACR25-4 / Aluminum

Features

  • Vented reinforced plastic chassis
  • Anodised aluminium cone
  • Low damping rubber surround
  • Large vented motor system
  • Long stroke linear suspension
  • Light weight CCAW voice coil
  • Non-conducting fibreglass coil former
  • Non-resonant long life lead wires
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Additional information

Nominal Impedance

4 Ω

DC resistance

Re 3.1 Ω

Voice coil inductance

Le 0.25 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

1.03 T

Magnet weight

0.40 kg

Net Weight

0.86 kg

Free air resonance

Fs 52.5 Hz

Sensitivity

(2.83 V / 1 m) 87 dB

Mechanical Q-factor

Qms 5.0

Electrical Q-factor

Qes 0.33

Total Q-factor

Qts 0.31

Moving mass incl. air

Mms 6.1 g

Force factor

Bl 4.35 Tm

Equivalent volume

VAS 5.3 liters

Compliance

Cms 1.50 mm/N

Mechanical loss

Rms 0.4 kg/s

Rated power handling

* 30 W

Note

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

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