Celestion CF0820M

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.9dB
• Frequency response 150 - 6000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 202Hz
• Mechanical quality factor QMS 1.78
• Electrical quality factor QES 0.83
• Total quality factor QTS 0.57

Large signal parameters

• Maximum linear excursion xmax 3.5mm
• Air volume displaced at xmax VD 79cm³
• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.4Ω
• Inductance (1kHz) LE 0.12mH
• VC Diameter 50mm
• Winding height HVC 11mm
• Winding material Copper clad aluminium
• Former material Glass fibre

Magnet

• Force factor Bl 13.3N/A
• Motor constant Bl/√RE 5.72N/√W
• Air gap height HAG 8mm
• Weight 1.3kg
• Material Ferrite

Diaphragm

• Effective diameter 170mm
• Effective area SD 227cm²
• Moving mass MMS 21.4g
• Moving mass (without air load) MMD 18.8g
• Material Treated paper

Suspensions

• Stiffness KMS 33.3N/mm
• Compliance CMS 30µm/N
• Equivalent volume to the compliance VAS 2.12L
• Mechanical resistance RMS 15.2N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 8″
• 200mm
• Overall diameter 215mm
• Baffle cutout diameter 187mm
• Overall depth 113mm
• Volume occupied by the driver (estimated) 1.2L
• Net weight 3.4kg
• Frame material Cast aluminium