Celestion FTR12-4080DL

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.4dB
• Frequency response 20 - 300Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 28.9Hz
• Mechanical quality factor QMS 2.47
• Electrical quality factor QES 0.35
• Total quality factor QTS 0.30

Large signal parameters

• Maximum linear excursion xmax 13.6mm
• Air volume displaced at xmax VD 722cm³
• Power handling P 700W
• Program power Pmax 1400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.2Ω
• Inductance (1kHz) LE 2.07mH
• VC Diameter 100mm
• Winding height HVC 32mm
• Winding material Round copper
• Former material Aluminium

Magnet

• Force factor Bl 24.1N/A
• Motor constant Bl/√RE 9.63N/√W
• Air gap height HAG 9.5mm
• Weight 3.6kg
• Material Ferrite

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 176g
• Moving mass (without air load) MMD 167g
• Material Glass loaded paper (weather-resistant)

Suspensions

• Stiffness KMS 5.88N/mm
• Compliance CMS 170µm/N
• Equivalent volume to the compliance VAS 68.6L
• Mechanical resistance RMS 13N·s/m
• Surround material Elastomer

Dimensions

• Nominal diameter 12″
• 305mm
• Overall diameter 313mm
• Baffle cutout diameter 282mm
• Overall depth 169mm
• Volume occupied by the driver (estimated) 4.2L
• Net weight 10.2kg
• Frame material Cast aluminium