Celestion FTX0820

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.6dB
• Frequency response 70 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 78.8Hz
• Mechanical quality factor QMS 2.80
• Electrical quality factor QES 0.31
• Total quality factor QTS 0.28

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 91cm³
• Power handling P 200W
• Program power Pmax 400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.9Ω
• Inductance (1kHz) LE 0.62mH
• VC Diameter 50mm
• Winding height HVC 12mm
• Winding material Edgewound copper
• Former material Glass fibre

Magnet

• Force factor Bl 14.6N/A
• Motor constant Bl/√RE 6.02N/√W
• Air gap height HAG 8mm
• Weight 1.5kg
• Material Ferrite

Diaphragm

• Effective diameter 170mm
• Effective area SD 227cm²
• Moving mass MMS 22.7g
• Moving mass (without air load) MMD 20g
• Material Kevlar loaded paper

Suspensions

• Stiffness KMS 5.56N/mm
• Compliance CMS 180µm/N
• Equivalent volume to the compliance VAS 13.1L
• Mechanical resistance RMS 4.01N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 8″
• 200mm
• Overall diameter 225mm
• Baffle cutout diameter 187mm
• Overall depth 123mm
• Volume occupied by the driver (estimated) 1.5L
• Net weight 4.1kg
• Frame material Cast aluminium