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SB Acoustics SB23NBACS45-4 Aluminium Woofer

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The SB Acoustics SB23NBACS45-4 is an 8 inch 4 ohm woofer / bass speaker featuring an aluminium cone, a 45mm voice coil and a shallow profile vented cast aluminium chassis. The cone features geometric reinforcing ribs which control diaphragm breakups / bell modes allowing for a smoother extended frequency response. A versatile unit designed for applications with restricted rear depth.

Also available in 8 ohms: SB23NBACS45-8.

Key Features:

  • Soft low damping rubber surround for improved transient response.
  • Geometrically reinforced aluminium cone for improved break-up control.
  • Shorting ring in motor system for reduced distortion.
  • Vented pole piece for reduced compression.
  • Vented cast aluminium 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) 23 Hz Nominal impedance (Zn) 4 Ω
Mechanical  Q factor (Qms) 5.4
DC resistance (Re) 3.3 Ω
Electrical Q factor (Qes) 0.35
Max power handling 60W
Total Q factor (Qts) 0.33
Sensitivity (2.83V/1m)
90dB
Equivalent volume (Vas) 95L Chassis diameter
234mm

Here's the full datasheet:

.pdf link

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