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SB Acoustics SB65WBAC25-4 Full Range Speaker

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The SB Acoustics SB65WBAC25-4 is a 2.5 inch 4 ohm full range loudspeaker drive unit featuring a profiled aluminium cone and a neodymium magnet assembly. The geometrically furoughed cone and copper capped pole piece help control breakup and improve the high frequency response.

Key Features:

  • Linear neodymium motor system for reduced distortion
  • Vented voice coil former for reduced compression
  • Low damping surround and non-conductive voice coil former
  • Copper cap for increased HF output and reduced phase shift
  • Wide frequency response

Basic parameters:

Resonant frequency (fs) 115 Hz Nominal impedance (Zn) 4 Ω
Mechanical  Q factor (Qms) 6.0 DC resistance (Re) 3.6 Ω
Electrical Q factor (Qes) 0.77
Max power handling 20 W
Total Q factor (Qts) 0.68
Sensitivity (2.83V/1m)
Equivalent volume (Vas) 0.43L Chassis (square)

Here's the full datasheet:

.pdf link