Celestion PowerProX18

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.8dB
• Frequency response 35 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 34.8Hz
• Mechanical quality factor QMS 3.15
• Electrical quality factor QES 0.43
• Total quality factor QTS 0.38

Large signal parameters

• Maximum linear excursion xmax 9.6mm
• Maximum excursion before damage xlim 48mm
• Air volume displaced at xmax VD 1162cm³
• Power handling P 1200W
• Program power Pmax 2400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.1Ω
• Inductance (1kHz) LE 1.61mH
• VC Diameter 100mm
• Winding height HVC 25mm
• Winding material Round copper
• Former material Glass fibre

Magnet

• Force factor Bl 24.4N/A
• Motor constant Bl/√RE 10.8N/√W
• Air gap height HAG 11.8mm
• Weight 3.5kg
• Material Ferrite

Diaphragm

• Effective diameter 393mm
• Effective area SD 1210cm²
• Moving mass MMS 230g
• Moving mass (without air load) MMD 201g
• Material Glass loaded cellulose, water-resistant

Suspensions

• Stiffness KMS 11N/mm
• Compliance CMS 91µm/N
• Equivalent volume to the compliance VAS 189L
• Mechanical resistance RMS 16N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 18″
• 457mm
• Overall diameter 460mm
• Baffle cutout diameter 414mm
• Overall depth 225mm
• Flange thickness 16mm
• Mounting depth 209mm
• Volume occupied by the driver (estimated) 7.6L
• Net weight 13.2kg
• Frame material Cast aluminium