Celestion FTR15-3070E

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.1dB
• Frequency response 40 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 45.9Hz
• Mechanical quality factor QMS 3.41
• Electrical quality factor QES 0.43
• Total quality factor QTS 0.38

Large signal parameters

• Maximum linear excursion xmax 7.8mm
• Air volume displaced at xmax VD 663cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.5Ω
• Inductance (1kHz) LE 1.21mH
• VC Diameter 75mm
• Winding height HVC 20mm
• Winding material Round copper
• Former material Glass fibre

Magnet

• Force factor Bl 17.9N/A
• Motor constant Bl/√RE 7.61N/√W
• Air gap height HAG 9mm
• Weight 2.3kg
• Material Ferrite

Diaphragm

• Effective diameter 330mm
• Effective area SD 855cm²
• Moving mass MMS 85.5g
• Moving mass (without air load) MMD 68.2g
• Material Glass loaded paper (weather-resistant)

Suspensions

• Stiffness KMS 7.14N/mm
• Compliance CMS 140µm/N
• Equivalent volume to the compliance VAS 146L
• Mechanical resistance RMS 7.23N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 15″
• 381mm
• Overall diameter 385mm
• Baffle cutout diameter 351mm
• Overall depth 161mm
• Volume occupied by the driver (estimated) 3.4L
• Net weight 6.4kg
• Frame material Cast aluminium