Celestion FTR12-3070C

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.3dB
• Frequency response 40 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 65.1Hz
• Mechanical quality factor QMS 2.80
• Electrical quality factor QES 0.36
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 5.5mm
• Air volume displaced at xmax VD 292cm³
• Power handling P 350W
• Program power Pmax 700W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.6Ω
• Inductance (1kHz) LE 1.09mH
• VC Diameter 75mm
• Winding height HVC 16mm
• Winding material Round copper
• Former material Glass fibre

Magnet

• Force factor Bl 18.6N/A
• Motor constant Bl/√RE 7.86N/√W
• Air gap height HAG 10mm
• Weight 2.3kg
• Material Ferrite

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 54.6g
• Moving mass (without air load) MMD 45.8g
• Material Glass loaded paper (weather-resistant)

Suspensions

• Stiffness KMS 9.09N/mm
• Compliance CMS 110µm/N
• Equivalent volume to the compliance VAS 43.7L
• Mechanical resistance RMS 7.96N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 12″
• 305mm
• Overall diameter 318mm
• Baffle cutout diameter 286mm
• Overall depth 102mm
• Volume occupied by the driver (estimated) 2.2L
• Net weight 6.3kg
• Frame material Cast aluminium