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4″ SB12MNRX25-4 / Paper

Remark:

To be discontinued from standard product range, available to OEM minimum order quantity 200 pcs.

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 0.14 mH
  • Effective piston area, Sd 50 cm2
  • Voice coil diameter 25.4 mm
  • Voice coil height 9.5 mm
  • Air gap height 5 mm
  • Linear coil travel (p-p) 4.5 mm
  • Magnetic flux density 0.9 T
  • Magnet weight 0.4 kg
  • Net weight 0.85 kg
  • Free air resonance, Fs 58 Hz
  • Sensitivity (2.83 V / 1 m) 88.5 dB
  • Mechanical Q-factor, Qms 3.6
  • Electrical Q-factor, Qes 0.42
  • Total Q-factor, Qts 0.37
  • Moving mass incl. air, Mms 4.9 g
  • Force factor, Bl 3.7 Tm
  • Equivalent volume, VAS 5.5 liters
  • Compliance, Cms 1.55 mm/N
  • Mechanical loss, Rms 0.5 kg/s
  • Rated power handling* 50 W

* IEC 268-5, high-pass Butterworth, 200 Hz, 12 dB/oct.