Celestion CF1840H

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.6dB
• Frequency response 30 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 38.5Hz
• Mechanical quality factor QMS 3.92
• Electrical quality factor QES 0.39
• Total quality factor QTS 0.35

Large signal parameters

• Maximum linear excursion xmax 8mm
• Air volume displaced at xmax VD 907cm³
• Power handling P 1000W
• Program power Pmax 2000W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.0Ω
• Inductance (1kHz) LE 0.95mH
• VC Diameter 100mm
• Winding height HVC 25mm
• Winding material Round copper
• Former material Glass fibre

Magnet

• Force factor Bl 17.4N/A
• Motor constant Bl/√RE 9.99N/√W
• Air gap height HAG 9.5mm
• Weight 3.18kg
• Material Ferrite

Diaphragm

• Effective diameter 380mm
• Effective area SD 1134cm²
• Moving mass MMS 159g
• Moving mass (without air load) MMD 131g
• Material Carbon fibre loaded paper

Suspensions

• Stiffness KMS 9.09N/mm
• Compliance CMS 110µm/N
• Equivalent volume to the compliance VAS 197L
• Mechanical resistance RMS 9.76N·s/m

Dimensions

• Nominal diameter 18″
• 457mm
• Overall diameter 460mm
• Baffle cutout diameter 414mm
• Overall depth 220mm
• Volume occupied by the driver (estimated) 6.9L
• Net weight 11.6kg
• Frame material Cast aluminium