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SB Acoustics

SB Acoustics SB12NRX25-8 4" Norex Cone Woofer

SB Acoustics SB12NRX25-8 4" Norex Cone Woofer

Regular price Rs. 5,300.00
Regular price Sale price Rs. 5,300.00
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  • Proprietary cone material with natural fibres made in-house
  • High damping Butyl rubber surround for non-resonant sound character
  • Vented pole piece for reduced compression
  • Vented cast aluminium chassis for optimum strength and low compression
  • CCAW voice coil for reduced moving mass
  • Long life silver lead wires
  • Non-conducting fibre glass coil former for minimum damping
  • Shorting ring in motor system for reduced distortion


  • Nominal Impedance 8 Ω
  • DC resistance, Re 6.4 Ω
  • Voice coil inductance, Le 0.34 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 1.07 T
  • Magnet weight 0.40 kg
  • Net weight 0.92 kg
  • Free air resonance, Fs 57 Hz
  • Sensitivity (2.83 V / 1 m) 85.5 dB
  • Mechanical Q-factor, Qms 4.1
  • Electrical Q-factor, Qes 0.41
  • Total Q-factor, Qts 0.37
  • Moving mass incl. air, Mms 5.2 g
  • Force factor, Bl 5.4 Tm
  • Equivalent volume, VAS 5.3 liters
  • Compliance, Cms 1.49 mm/N
  • Mechanical loss, Rms 0.45 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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