Celestion CF18VJD

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.9dB
• Frequency response 25 - 1500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 34.5Hz
• Mechanical quality factor QMS 4.57
• Electrical quality factor QES 0.33
• Total quality factor QTS 0.31

Large signal parameters

• Maximum linear excursion xmax 12mm
• Air volume displaced at xmax VD 1361cm³
• Power handling P 1600W
• Program power Pmax 3200W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.1Ω
• Inductance (1kHz) LE 1.87mH
• VC Diameter 125mm
• Winding height HVC 30mm
• Winding material Round copper
• Former material Glass fibre

Magnet

• Force factor Bl 32.6N/A
• Motor constant Bl/√RE 13.2N/√W
• Air gap height HAG 12mm
• Weight 4.93kg
• Material Ferrite

Diaphragm

• Effective diameter 380mm
• Effective area SD 1134cm²
• Moving mass MMS 265g
• Moving mass (without air load) MMD 238g
• Material Carbon and kevlar loaded paper

Suspensions

• Stiffness KMS 12.5N/mm
• Compliance CMS 80µm/N
• Equivalent volume to the compliance VAS 146L
• Mechanical resistance RMS 12.6N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 18″
• 457mm
• Overall diameter 462mm
• Baffle cutout diameter 416mm
• Overall depth 233mm
• Volume occupied by the driver (estimated) 11L
• Net weight 23.0kg
• Frame material Cast aluminium