P.Audio C18-1200

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94dB
• Frequency response 35 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 38Hz
• Mechanical quality factor QMS 9.76
• Electrical quality factor QES 0.50
• Total quality factor QTS 0.48

Large signal parameters

• Maximum linear excursion xmax 8.5mm
• Air volume displaced at xmax VD 1041cm³
• Power handling P 1200W
• Program power Pmax 2400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.9Ω
• Inductance (1kHz) LE 0.98mH
• VC Diameter 114.4mm
• Winding height HVC 31mm
• Winding material Copper
• Former material Glass fiber

Magnet

• Flux density B 1.2T
• Force factor Bl 26.8N/A
• Motor constant Bl/√RE 11N/√W
• Air gap height HAG 14mm
• Material Ferrite

Diaphragm

• Effective diameter 395mm
• Effective area SD 1225cm²
• Moving mass MMS 244g
• Moving mass (without air load) MMD 214g
• Material Waterproof Paper

Suspensions

• Stiffness KMS 14.3N/mm
• Compliance CMS 70µm/N
• Equivalent volume to the compliance VAS 149L
• Mechanical resistance RMS 5.97N·s/m
• Surround material Cloth
• Spider material Cotton (Double Silicone)

Dimensions

• Nominal diameter 18″
• 457mm
• Overall diameter 467mm
• Baffle cutout diameter 425mm
• Overall depth 224mm
• Flange thickness 23mm
• Mounting depth 201mm
• Volume occupied by the driver (estimated) 9.3L
• Net weight 18.1kg
• Frame material Aluminium