Celestion CF1230BMB

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.3dB
• Frequency response 50 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 43.4Hz
• Mechanical quality factor QMS 4.45
• Electrical quality factor QES 0.42
• Total quality factor QTS 0.38

Large signal parameters

• Maximum linear excursion xmax 7mm
• Air volume displaced at xmax VD 372cm³
• Power handling P 350W
• Program power Pmax 700W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.8Ω
• Inductance (1kHz) LE 0.713mH
• VC Diameter 75mm
• Winding height HVC 18mm
• Winding material Copper clad aluminium
• Former material Glass Fibre

Magnet

• Force factor Bl 18.4N/A
• Motor constant Bl/√RE 7.61N/√W
• Air gap height HAG 8mm
• Weight 2.2kg
• Material Ferrite

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 88.4g
• Moving mass (without air load) MMD 79.7g
• Material Glass loaded paper (weather-resistant)

Suspensions

• Stiffness KMS 6.58N/mm
• Compliance CMS 152µm/N
• Equivalent volume to the compliance VAS 60.7L
• Mechanical resistance RMS 5.42N·s/m
• Surround material Elastomer

Dimensions

• Nominal diameter 12″
• 305mm
• Overall diameter 315mm
• Baffle cutout diameter 286mm
• Overall depth 156mm
• Volume occupied by the driver (estimated) 3L
• Net weight 6.75kg
• Frame material Cast aluminium