P.Audio SD18-1700EL

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.3dB
• Frequency response 35 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 45Hz
• Mechanical quality factor QMS 11.10
• Electrical quality factor QES 0.63
• Total quality factor QTS 0.59

Large signal parameters

• Maximum linear excursion xmax 4.9mm
• Air volume displaced at xmax VD 594cm³
• Power handling P 1700W
• Program power Pmax 3400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 1.02mH
• VC Diameter 114.4mm
• Winding height HVC 24.7mm
• Winding material SV-SQ
• Former material Glass fiber

Magnet

• Flux density B 0.8T
• Force factor Bl 25.9N/A
• Motor constant Bl/√RE 11.4N/√W
• Air gap height HAG 15mm
• Material Ferrite

Diaphragm

• Effective diameter 395mm
• Effective area SD 1225cm²
• Moving mass MMS 308g
• Moving mass (without air load) MMD 277g
• Material Waterproof Paper

Suspensions

• Stiffness KMS 21.3N/mm
• Compliance CMS 47µm/N
• Equivalent volume to the compliance VAS 99.7L
• Mechanical resistance RMS 7.84N·s/m
• Surround material Cloth
• Spider material Cotton (Double Silicone)

Dimensions

• Nominal diameter 18″
• 457mm
• Overall diameter 476mm
• Baffle cutout diameter 428mm
• Overall depth 228mm
• Flange thickness 17mm
• Mounting depth 211mm
• Volume occupied by the driver (estimated) 8.2L
• Net weight 14.2kg
• Frame material Aluminium