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SB Acoustics SB12PFCR25-4 Paper Midwoofer

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The SB12PFCR25-4 by SB Acoustics is a 4 inch 4 ohm midwoofer speaker featuring a blended paper fibre cone, a vented reinforced plastic chassis and an optimised long throw motor system. Smooth extended response, excellent value.

Also available in 8 ohms: SB12PFCR25-8.

Key Features:

  • Vented reinforced plastic chassis.
  • Proprietary cone material with natural fibers made in-house.
  • Butyl rubber surround for smooth frequency response.
  • Vented motor system for low compression.
  • Long stroke linear suspension for improved dynamics.
  • Non-resonant long life lead wires.

Basic parameters:

Resonant frequency (fs) 58 Hz Nominal impedance (Zn) 4 Ω
Mechanical  Q factor (Qms) 3.4
DC resistance (Re) 3.1 Ω
Electrical Q factor (Qes) 0.49
Max power handling 30 W
Total Q factor (Qts) 0.43
Sensitivity (2.83V/1m)
Equivalent volume (Vas) 5.2L Chassis diameter

Here's the full datasheet:

.pdf link