Celestion TF1830

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.4dB
• Frequency response 35 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35.7Hz
• Mechanical quality factor QMS 4.21
• Electrical quality factor QES 0.43
• Total quality factor QTS 0.39

Large signal parameters

• Maximum linear excursion xmax 4.5mm
• Air volume displaced at xmax VD 510cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 2.6Ω
• Inductance (1kHz) LE 1.28mH
• VC Diameter 75mm
• Winding height HVC 17mm
• Winding material Round copper
• Former material Glass Fibre

Magnet

• Force factor Bl 15.5N/A
• Motor constant Bl/√RE 9.62N/√W
• Air gap height HAG 8mm
• Weight 1.8kg
• Material Ferrite

Diaphragm

• Effective diameter 380mm
• Effective area SD 1134cm²
• Moving mass MMS 179g
• Moving mass (without air load) MMD 152g
• Material Glass loaded paper (weather-resistant)

Suspensions

• Stiffness KMS 9.09N/mm
• Compliance CMS 110µm/N
• Equivalent volume to the compliance VAS 202L
• Mechanical resistance RMS 9.53N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 18″
• 457mm
• Overall diameter 460mm
• Baffle cutout diameter 421mm
• Overall depth 209mm
• Volume occupied by the driver (estimated) 5L
• Net weight 7.5kg
• Frame material Pressed steel