B&C Speaker 8CX21

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.4dB
• Frequency response 75 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 74Hz
• Mechanical quality factor QMS 4.10
• Electrical quality factor QES 0.39
• Total quality factor QTS 0.36

Large signal parameters

• Maximum linear excursion xmax 5.5mm
• Air volume displaced at xmax VD 121cm³
• Power handling P 200W
• Program power Pmax 400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 1.2mH
• VC Diameter 52mm
• Winding height HVC 16mm
• Winding material Copper
• Former material Kapton

Magnet

• Flux density B 1.1T
• Force factor Bl 11.5N/A
• Motor constant Bl/√RE 5.04N/√W
• Air gap height HAG 8mm
• Material Ferrite

Diaphragm

• Effective diameter 167mm
• Effective area SD 220cm²
• Moving mass MMS 21g
• Moving mass (without air load) MMD 18.5g
• Material Waterproof Front Side

Suspensions

• Stiffness KMS 4.61N/mm
• Compliance CMS 217µm/N
• Equivalent volume to the compliance VAS 15L
• Mechanical resistance RMS 2.38N·s/m

Dimensions

• Nominal diameter 8″
• 210mm
• Overall diameter 225mm
• Baffle cutout diameter 187mm
• Overall depth 135mm
• Flange thickness 11mm
• Mounting depth 124mm
• Volume occupied by the driver (estimated) 1.6L
• Net weight 4.1kg