B&C 8CX21 Drive Unit

• 400 W continuous program power capacity
• 100° nominal coverage
• 75 – 20000 Hz response
• 94 dB sensitivity
• XO-1 dedicated crossover network

Specifications

• Nominal Diameter
  210 mm (8 in)
• Nominal Impedance
  8 ohm
• Minimum Impedance
  6.1 Ohm (LF) 7.2 Ohm (HF)
• Frequency Range
  75 - 20000 Hz
• Dispersion Angle
  100°
• Diaphragm Material
  Mylar
• Recom Crossover
  2.2 kHz
• Magnet Material
  Ceramic
• LF Unit
• Sensitivity (1W/1m)
  94 dB
• Nominal Power Handling (AES)
  200 W
• Continuous Power Handling
  400 W
• Voice Coil Diameter
  52 mm (2 in)
• Winding Material
  Copper
• HF Unit
• Sensitivity (1W/1m)
  101 dB
• Nominal Power Handling (AES)
  25 W
• Continuous Power Handling
  50 W
• Voice Coil Diameter
  36 mm (1.4 in)
• Winding Material
  Aluminium

Parameters

• Fs
  74 Hz
• Re
  5.2 ohm
• Qes
  0.39
• Qms
  4.1
• Qts
  0.36
• Vas
  15 dm³ (0.55 ft³)
• Sd
  220 cm² (34.10 in²)
• η₀
  1.5 %
• Xmax
  ± 5 mm
• Xvar
  ± 5.5 mm
• Mms
  21 g
• Bl
  11.5 Txm
• Le
  1.2 mH

Mounting and Shipping info

• Overall Diameter
  225 mm (8.8 in)
• Bolt Circle Diameter
  210 mm (8.3 in)
• Baffle Cutout Diameter
  187 mm (7.4 in)
• Depth
  135 mm (5.3 in)
• Flange and Gasket Thickness
  11 mm (0.4 in)
• Net Weight
  4 kg (8.8 lb)
• Shipping Weight
  4.7 kg (10.3 lb)
• Shipping Box
  260x260x170 mm (10.2x10.2x6.7 in)

Crossover (optional extra)

• Model
  XO-1
• Filter Type
  Two way
• Nominal Impedance
  8 ohm
• Crossover Frequency
  2 kHz
• Slope
  12 dB/oct. (low) 12 dB/oct. (high)
• Overall Dimension
  107x96 mm (4.2x3.8 in)
• Weight
  0.4 kg (0.9 lb)