SB12CACS25 / Ceramic

The SB Acoustics SB12CACS25 4" (10cm) midrange driver with Ceramic membrane is available in a 4 Ohm and 8 Ohm variant. The ultra-light and stiff membrane is driven by a powerful ferrite magnet. The resonance frequency around 50 Hz is well outside the usable range, allowing the driver to perform extremely linearly within the usable range and making it ideal for 2-way applications or as a pure midrange driver. The generously ventilated centering spider optimizes the rear compression behavior to a maximum and provides additional cooling.

Features: 

• Ventilated aluminum die-cast chassis for optimal strength and low compression
  
• Ceramic membrane
  
• Soft rubber edge with low damping for improved
• settling behavior
  
• Short-circuit ring in the motor system for reduced distortions
  
• Non-conductive glass fiber coil carrier for minimal damping
  
• CCAW coil for reduced moving mass
  
• Durable silver wires
  
• Ventilated pole shoe for reduced compression

Data 4 Ohm variant: 

• Nominal impedance 4 Ω
  
• Frequency range 110Hz - 3 kHz
• Direct current resistance, Re 3.1 Ω
  
• Inductance of the oscillating coil, Le 0.26 mH
  
• Effective membrane area, Sd 50 cm2
  
• Winding coil diameter 25.4 mm
  
• Height of the oscillating coil 15 mm
  
• Height of air gap 5 mm
  
• Linear coil stroke (p-p) 10 mm
  
• Magnetic flux density 1.07 T
  
• Weight of the magnet 0.40 kg
  
• Net weight 0.92 kg
  
• Free air resonance, Fs 51 Hz
  
• Sensitivity (2.83 V / 1 m) 88 dB
  
• Mechanical Q-factor, Qms 4.89
  
• Electrical Q-factor, Qes 0.33
  
• Total Q factor, Qts 0.31
  
• Moving mass including air, Mms 6.1 g
  
• Power factor, Bl 4.3 Tm
  
• Equivalence volume, VAS 5.7 liters
  
• Compliance, Cms 1.60 mm/N
  
• Mechanical loss, Rms 0.4 kg/s
  
• Rated load capacity* 30 W
  
• IEC 268-5, T/S-Parameter measured on retracted drive units.

Data 8 Ohm variant: 

• Nominal impedance 8 Ω
  
• Frequency range 110Hz - 3 kHz
• Direct current resistance, Re 6.4 Ω
  
• Inductance of the oscillating coil, Le 0.34 mH
  
• Effective membrane area, Sd 50 cm2
  
• Winding coil diameter 25.4 mm
  
• Height of the oscillating coil 15 mm
  
• Height of air gap 5 mm
  
• Linear coil stroke (p-p) 10 mm
  
• Magnetic flux density 1.07 T
  
• Weight of the magnet 0.40 kg
  
• Net weight 0.92 kg
  
• Free air resonance, Fs 51 Hz
  
• Sensitivity (2.83 V / 1 m) 85.5 dB
  
• Mechanical Q-factor, Qms 4.85
  
• Electrical Q-factor, Qes 0.4
  
• Total Q factor, Qts 0.37
  
• Moving mass including air, Mms 5.3 g
  
• Power factor, Bl 5.2 Tm
  
• Equivalence volume, VAS 6.5 liters
  
• Compliance, Cms 1.84 mm/N
  
• Mechanical loss, Rms 0.35 kg/s
  
• Rated load capacity* 30 W
  
• IEC 268-5, T/S-Parameter measured on retracted drive units.

Dimensions: