P.Audio C18-650EL v3

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.5dB
• Frequency response 35 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 41Hz
• Mechanical quality factor QMS 12.26
• Electrical quality factor QES 0.55
• Total quality factor QTS 0.52

Large signal parameters

• Maximum linear excursion xmax 5.3mm
• Air volume displaced at xmax VD 643cm³
• Power handling P 1000W
• Program power Pmax 2000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.6Ω
• Inductance (1kHz) LE 0.83mH
• VC Diameter 99.3mm
• Winding height HVC 25.5mm
• Winding material Flat aluminium wire
• Former material Glass fiber

Magnet

• Flux density B 1T
• Force factor Bl 21.5N/A
• Motor constant Bl/√RE 9.07N/√W
• Air gap height HAG 15mm
• Material Ferrite

Diaphragm

• Effective diameter 396mm
• Effective area SD 1225cm²
• Moving mass MMS 172g
• Moving mass (without air load) MMD 144g
• Material Paper

Suspensions

• Stiffness KMS 11.9N/mm
• Compliance CMS 84µm/N
• Equivalent volume to the compliance VAS 179L
• Mechanical resistance RMS 3.62N·s/m
• Surround material Cloth
• Spider material Cotton (Double)

Dimensions

• Nominal diameter 18″
• 457mm
• Overall diameter 446mm
• Baffle cutout diameter 426mm
• Overall depth 226mm
• Flange thickness 19mm
• Mounting depth 207mm
• Volume occupied by the driver (estimated) 7.7L
• Net weight 13.9kg
• Frame material Aluminium