P.Audio C18-1000 v4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.6dB
• Frequency response 35 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35Hz
• Mechanical quality factor QMS 12.52
• Electrical quality factor QES 0.58
• Total quality factor QTS 0.56

Large signal parameters

• Maximum linear excursion xmax 9.5mm
• Air volume displaced at xmax VD 1164cm³
• Power handling P 1300W
• Program power Pmax 2600W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.5Ω
• Inductance (1kHz) LE 1.11mH
• VC Diameter 114.4mm
• Winding height HVC 34mm
• Winding material Round Copper Wire
• Former material Glass Fiber

Magnet

• Flux density B 0.9T
• Force factor Bl 22.5N/A
• Motor constant Bl/√RE 9.61N/√W
• Air gap height HAG 15mm
• Material Ferrite

Diaphragm

• Effective diameter 395mm
• Effective area SD 1225cm²
• Moving mass MMS 247g
• Moving mass (without air load) MMD 217g
• Material Waterproof Paper

Suspensions

• Stiffness KMS 11.8N/mm
• Compliance CMS 85µm/N
• Equivalent volume to the compliance VAS 184L
• Mechanical resistance RMS 4.34N·s/m
• Surround material Cloth
• Spider material Double Silicone

Dimensions

• Nominal diameter 18″
• 457mm
• Overall diameter 466mm
• Baffle cutout diameter 426mm
• Overall depth 249mm
• Flange thickness 22mm
• Mounting depth 227mm
• Volume occupied by the driver (estimated) 9.1L
• Net weight 15.6kg
• Frame material Aluminium