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SB Acoustics SB15NBAC30-4 Aluminium Midwoofer

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The SB Acoustics SB15NBAC30-4 is a 5 inch 4 ohm midwoofer featuring a black aluminium cone and a vented cast alloy chassis. The rigid cone has pressed geometric reinforcement troughs that suppress ringing / breakup modes offering extended pistonic action, this results in a much wider usable response than normally found with metal coned drive units.

Also available in 8 ohms: SB15NBAC30-8.

Key Features:

  • Vented cast aluminium chassis for optimum strength and low compression.
  • Geometrically reinforced aluminum cone for optimum piston operation and reduced break-up.
  • Soft low damping rubber surround for improved transient response.
  • Non-conducting fibre glass voice coil former for minimum damping.
  • Extended copper sleeve on pole piece for low inductance and low distortion.
  • CCAW voice coil for reduced moving mass.
  • Long life silver lead wires.
  • Vented pole piece for reduced compression.

Basic parameters:

Resonant frequency (fs) 33 Hz Nominal impedance (Zn) 4 Ω
Mechanical  Q factor (Qms) 4.4
DC resistance (Re) 3.1 Ω
Electrical Q factor (Qes) 0.31
Max power handling 50 W
Total Q factor (Qts) 0.29
Sensitivity (2.83V/1m)
Equivalent volume (Vas) 21L Chassis diameter

Here's the full datasheet:

.pdf link