SB Acoustics SB23NBACS45-8

Woofer

Nominal diameter8″ / 203 mm
Resonance25 Hz
Q factor0.40
Sensitivity86.4 dB
Linear excursion± 6.5 mm
Program Power120 W
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
Discard
Apply
  • Sensitivity (1W, 1m, infinite baffle) SPL1W 86.4dB

Thiele & Small parameters

  • Resonance frequency (free air) fS 25Hz
  • Mechanical quality factor QMS 5.54
  • Electrical quality factor QES 0.43
  • Total quality factor QTS 0.40

Large signal parameters

  • Maximum linear excursion xmax 6.5mm
  • Air volume displaced at xmax VD 140cm³
  • Power handling P 60W
  • Program power Pmax 120W

Voice Coil

  • Nominal impedance Z 8Ω
  • DC resistance RE 5.7Ω
  • Inductance (1kHz) LE 0.37mH
  • VC Diameter 45.5mm
  • Winding height HVC 19mm
  • Winding material Copper Clad Aluminium
  • Former material Glass Fiber

Magnet

  • Flux density B 0.9T
  • Force factor Bl 7.9N/A
  • Motor constant Bl/√RE 3.31N/√W
  • Air gap height HAG 6mm
  • Weight 0.8kg

Diaphragm

  • Effective diameter 166mm
  • Effective area SD 216cm²
  • Moving mass MMS 31.2g
  • Moving mass (without air load) MMD 28.9g
  • Material Aluminium

Suspensions

  • Stiffness KMS 0.699N/mm
  • Compliance CMS 1430µm/N
  • Equivalent volume to the compliance VAS 93.4L
  • Mechanical resistance RMS 0.8N·s/m
  • Surround material Rubber

Dimensions

  • Nominal diameter 8
  • 203mm
  • Volume occupied by the driver (estimated) 1.1L
  • Net weight 2.7kg
  • Frame material Cast aluminium
SB Acoustics SB23NBACS45-8 SPL & Impedance
SB Acoustics SB23NBACS45-8 Dimensions

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