Celestion FTR15-4080F

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.1dB
• Frequency response 35 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 38Hz
• Mechanical quality factor QMS 2.86
• Electrical quality factor QES 0.27
• Total quality factor QTS 0.25

Large signal parameters

• Maximum linear excursion xmax 8.5mm
• Air volume displaced at xmax VD 727cm³
• Power handling P 600W
• Program power Pmax 1200W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.7Ω
• Inductance (1kHz) LE 1.48mH
• VC Diameter 100mm
• Winding height HVC 22mm
• Winding material Round copper
• Former material Glass fibre

Magnet

• Force factor Bl 23.5N/A
• Motor constant Bl/√RE 9.89N/√W
• Air gap height HAG 10mm
• Weight 3.1kg
• Material Ferrite

Diaphragm

• Effective diameter 330mm
• Effective area SD 855cm²
• Moving mass MMS 112g
• Moving mass (without air load) MMD 94.4g
• Material Glass loaded paper (weather-resistant)

Suspensions

• Stiffness KMS 6.25N/mm
• Compliance CMS 160µm/N
• Equivalent volume to the compliance VAS 163L
• Mechanical resistance RMS 9.34N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 15″
• 381mm
• Overall diameter 385mm
• Baffle cutout diameter 351mm
• Overall depth 170mm
• Volume occupied by the driver (estimated) 4.5L
• Net weight 9.4kg
• Frame material Cast aluminium