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SB Acoustics SB12MNRX2-25-4 Midrange Speaker

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The SB Acoustics SB12MNRX2-25-4 is a 4 inch 4 ohm midrange loudspeaker drive unit featuring a proprietary Norex (blended fibre composite) cone. A feature packed unit offering a finely detailed midrange performance.

Key Features:

  • Shortened voice coil optimised for pure midrange reproduction.
  • High damping Butyl rubber surround for low colouration.
  • Vented cast aluminium chassis for optimum strength and low compression.
  • CCAW voice coil for reduced moving mass.
  • Non-conducting fibre glass coil former for minimal damping.
  • Faraday shorting ring in motor system for reduced distortion.
  • Long life silver lead wires.

Basic parameters:

Resonant frequency (fs) 63.5 Hz Nominal impedance (Zn) 4 Ω
Mechanical  Q factor (Qms) 4.19 DC resistance (Re) 3.2 Ω
Electrical Q factor (Qes) 0.35
Max power handling 50 W
Total Q factor (Qts) 0.32
Sensitivity (2.83V/1m)
Equivalent volume (Vas) 5.3L Chassis diameter

Here's the full datasheet:

.pdf link