Celestion FTX1025

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.1dB
• Frequency response 60 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 71.5Hz
• Mechanical quality factor QMS 2.79
• Electrical quality factor QES 0.52
• Total quality factor QTS 0.44

Large signal parameters

• Maximum linear excursion xmax 5mm
• Air volume displaced at xmax VD 173cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.4Ω
• Inductance (1kHz) LE 0.48mH
• VC Diameter 64mm
• Winding height HVC 14mm
• Winding material Edgewound copper clad aluminium
• Former material Glass fibre

Magnet

• Force factor Bl 12.3N/A
• Motor constant Bl/√RE 5.28N/√W
• Air gap height HAG 8mm
• Weight 1.5kg
• Material Ferrite

Diaphragm

• Effective diameter 210mm
• Effective area SD 346cm²
• Moving mass MMS 32.6g
• Moving mass (without air load) MMD 27.9g

Suspensions

• Stiffness KMS 6.67N/mm
• Compliance CMS 150µm/N
• Equivalent volume to the compliance VAS 25.9L
• Mechanical resistance RMS 5.25N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 10″
• 254mm
• Overall diameter 260mm
• Baffle cutout diameter 234mm
• Overall depth 123mm
• Volume occupied by the driver (estimated) 1.8L
• Net weight 4.5kg
• Frame material Cast aluminium