Celestion CF1230F

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.5dB
• Frequency response 50 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 56.5Hz
• Mechanical quality factor QMS 4.33
• Electrical quality factor QES 0.34
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 7.5mm
• Air volume displaced at xmax VD 398cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.1Ω
• Inductance (1kHz) LE 0.74mH
• VC Diameter 75mm
• Winding height HVC 19mm
• Winding material Edgewound copper clad aluminium
• Former material Glass fibre

Magnet

• Force factor Bl 18.3N/A
• Motor constant Bl/√RE 8.13N/√W
• Air gap height HAG 8mm
• Weight 2.2kg
• Material Ferrite

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 63.8g
• Moving mass (without air load) MMD 55g
• Material Glass loaded paper (weather-resistant)

Suspensions

• Stiffness KMS 8.33N/mm
• Compliance CMS 120µm/N
• Equivalent volume to the compliance VAS 49.6L
• Mechanical resistance RMS 5.23N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 12″
• 305mm
• Overall diameter 315mm
• Baffle cutout diameter 282mm
• Overall depth 153mm
• Volume occupied by the driver (estimated) 3L
• Net weight 6.8kg
• Frame material Cast aluminium