SB Acoustics SB23CACS45 / Ceramic

The SB Acoustics SB23CACS45 8" (20cm) woofer/midrange driver with ceramic/ceramic membrane is available in a 4 ohm and 8 ohm version. The ultra-light and stiff membrane is driven by a powerful ferrite magnet. The resonance frequency of around 30 Hz is far outside the usable range, which means that the driver is extremely linear in the usable range and can be used optimally in 2-way use or as a pure midrange driver. The generously ventilated centering spider optimizes the rear compression behavior to a maximum and provides additional cooling.

• Soft rubber surround with low damping for improved transient response
  
• Geometrically reinforced ceramic membrane for improved resolution control
  
• Short-circuit ring in the motor system for lower distortion
  
• Ventilated pole piece for lower compression
  
• Ventilated cast aluminum chassis for optimal strength and low compression
  
• Flat construction
  
• Non-conductive glass fiber voice coil former for minimal damping
  
• CCAW voice coil for reduced moving mass
  
• Durable silver wires

• nominal impedance 4 Ω
  
• frequency range 70Hz - 2kHz
• DC resistance, Re 3.3 Ω
  
• Inductance of the voice coil, Le 0.27 mH
  
• Effective membrane area, Sd 216 cm2
  
• Diameter of the voice coil 45.5 mm
  
• Height of the voice coil 19 mm
  
• height of the air gap 6 mm
  
• Linear coil stroke (pp) 13 mm
  
• Magnetic flux density 0.86 T
  
• Weight of the magnet 0.8 kg
  
• net weight 2.7 kg
  
• Free air resonance, Fs 23 Hz
  
• Sensitivity (2.83V/1m) 90 dB
  
• Mechanical Q-factor, Qms 6.0
  
• Electrical Q factor, Qes 0.35
  
• overall Q-factor, Qts 0.33
  
• Moving mass including air, Mms 33 g
  
• force factor, Bl 6.7 Tm
  
• Equivalent volume, Vas 95 liters
  
• Compliance, Cms 1.43 mm/N
  
• Mechanical loss, Rms 0.8 kg/s
  
• Nominal load capacity* 60 W
  
• * IEC 268-5, T/S parameters measured on retracted drives.

• nominal impedance 8 Ω
  
• frequency range 70Hz - 2kHz
• DC resistance, Re 5.6 Ω
  
• Inductance of the voice coil, Le 0.60 mH
  
• Effective membrane area, Sd 216 cm2
  
• voice coil diameter 45.5 mm
  
• Height of the voice coil 19 mm
  
• height of the air gap 6 mm
  
• Linear coil stroke (pp) 13 mm
  
• Magnetic flux density 0.86 T
  
• Weight of the magnet 0.8 kg
  
• net weight 2.7 kg
  
• Free air resonance, Fs 25 Hz
  
• Sensitivity (2.83 V / 1 m) 87.5 dB
  
• Mechanical Q-factor, Qms 5.41
  
• Electrical Q factor, Qes 0.44
  
• overall Q-factor, Qts 0.40
  
• Moving mass including air, Mms 31.G
  
• force factor, Bl 7.9 Tm
  
• Equivalent volume, VAS 87 liters
  
• Compliance, Cms 1.31 mm/N
  
• Mechanical loss, Rms 0.9 kg/s
  
• Nominal load capacity* 50 W
  
• * IEC 268-5, T/S parameters measured on retracted drives.