4in-SB12MNRX2-25-4

4” SB12MNRX2-25-4 / Norex

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Features

  • Proprietary cone material with natural fibres made in-house
  • Shortened voice coil optimized for pure midrange reproduction
  • 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

Specs

  • Nominal Impedance 4 Ω
  • DC resistance, Re 3.2 Ω
  • Voice coil inductance, Le 0.15 mH
  • Effective piston area, Sd 50 cm2
  • Voice coil diameter 25.4 mm
  • Voice coil height 9.4 mm
  • Air gap height 5 mm
  • Linear coil travel (p-p) 4.4 mm
  • Magnetic flux density 1.03 T
  • Magnet weight 0.4 kg
  • Net weight 0.92 kg
  • Free air resonance, Fs 58 Hz
  • Sensitivity (2.83V/1m) 91 dB
  • Mechanical Q-factor, Qms 3.60
  • Electrical Q-factor, Qes 0.29
  • Total Q-factor, Qts 0.27
  • Moving mass incl. air,Mms 4.1 g
  • Force factor, Bl 4.1 Tm
  • Equivalent volume, Vas 6.3 liters
  • Compliance, Cms 1.77 mm/N
  • Mechanical loss, Rms 0.4 kg/s
  • Rated power handling* 50 W

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