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SB Acoustics SB23NRXS45-4 Norex Woofer

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The SB Acoustics SB23NRXS45-4 is an 8 inch 4 ohm woofer / bass speaker featuring a Norex cone, a 45mm voice coil and a shallow profile vented cast aluminium chassis. Norex is a proprietary paper based material comprised of wood pulp and selected natural fibres blended for an optimally strong but lightweight cone that gives extended pistonic action. A versatile unit designed for applications with restricted rear depth.

Also available in 8 ohms: SB23NRXS45-8.

Key Features:

  • Soft low damping rubber surround for improved transient response.
  • Shorting ring in motor system for reduced distortion.
  • Vented pole piece for reduced compression.
  • Vented cast aluminum chassis for optimum strength and low compression.
  • Non-conducting fibre glass voice coil former for minimum damping.
  • CCAW voice coil for reduced moving mass.
  • Long life silver lead wires.
  • Shallow chassis design.

Basic parameters:

Resonant frequency (fs) 27 Hz Nominal impedance (Zn) 4 Ω
Mechanical  Q factor (Qms) 5.55
DC resistance (Re) 3.3 Ω
Electrical Q factor (Qes) 0.32
Max power handling 60W
Total Q factor (Qts) 0.30
Sensitivity (2.83V/1m)
87.5dB
Equivalent volume (Vas) 87.5L Chassis diameter
234mm

Here's the full datasheet:

.pdf link

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