Celestion TF1020

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.4dB
• Frequency response 60 - 5500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 69.4Hz
• Mechanical quality factor QMS 2.45
• Electrical quality factor QES 0.37
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 139cm³
• Power handling P 150W
• Program power Pmax 300W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.5Ω
• Inductance (1kHz) LE 0.6mH
• VC Diameter 50mm
• Winding height HVC 12mm
• Winding material Round copper
• Former material Polyimide

Magnet

• Force factor Bl 14.1N/A
• Motor constant Bl/√RE 6.04N/√W
• Air gap height HAG 8mm
• Weight 1.2kg
• Material Ferrite

Diaphragm

• Effective diameter 210mm
• Effective area SD 346cm²
• Moving mass MMS 31.1g
• Moving mass (without air load) MMD 26.5g
• Material Kevlar loaded paper

Suspensions

• Stiffness KMS 5.88N/mm
• Compliance CMS 170µm/N
• Equivalent volume to the compliance VAS 28.8L
• Mechanical resistance RMS 5.52N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 10″
• 254mm
• Overall diameter 256mm
• Baffle cutout diameter 229mm
• Overall depth 110mm
• Volume occupied by the driver (estimated) 1.4L
• Net weight 3.7kg
• Frame material Pressed steel