Celestion FTR15-4080FD

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95dB
• Frequency response 35 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35.4Hz
• Mechanical quality factor QMS 3.91
• Electrical quality factor QES 0.30
• Total quality factor QTS 0.28

Large signal parameters

• Maximum linear excursion xmax 8.5mm
• Air volume displaced at xmax VD 727cm³
• Power handling P 1000W
• Program power Pmax 2000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.6Ω
• Inductance (1kHz) LE 1.38mH
• VC Diameter 100mm
• Winding height HVC 22mm
• Winding material Round copper
• Former material Glass fibre

Magnet

• Force factor Bl 23.1N/A
• Motor constant Bl/√RE 9.74N/√W
• Air gap height HAG 10mm
• Weight 3.1kg
• Material Ferrite

Diaphragm

• Effective diameter 330mm
• Effective area SD 855cm²
• Moving mass MMS 127g
• Moving mass (without air load) MMD 110g
• Material Glass loaded paper (weather-resistant)

Suspensions

• Stiffness KMS 6.25N/mm
• Compliance CMS 160µm/N
• Equivalent volume to the compliance VAS 164L
• Mechanical resistance RMS 7.24N·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) 4.6L
• Net weight 9.5kg
• Frame material Cast aluminium