P.Audio 18NT-115XB

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

Thiele & Small parameters

• Resonance frequency (free air) fS 40Hz
• Mechanical quality factor QMS 13.27
• Electrical quality factor QES 0.45
• Total quality factor QTS 0.44

Large signal parameters

• Maximum linear excursion xmax 9.8mm
• Air volume displaced at xmax VD 1201cm³
• Power handling P 1600W
• Program power Pmax 3200W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 0.98mH
• VC Diameter 114.4mm
• Winding height HVC 33mm
• Winding material Copper
• Former material Glass fiber

Magnet

• Flux density B 1.2T
• Force factor Bl 29N/A
• Motor constant Bl/√RE 12.7N/√W
• Air gap height HAG 13.5mm
• Material Neodymium

Diaphragm

• Effective diameter 395mm
• Effective area SD 1225cm²
• Moving mass MMS 288g
• Moving mass (without air load) MMD 258g
• Material Waterproof Paper

Suspensions

• Stiffness KMS 18.9N/mm
• Compliance CMS 53µm/N
• Equivalent volume to the compliance VAS 113L
• Mechanical resistance RMS 5.46N·s/m
• Surround material Cloth
• Spider material Double Silicone

Dimensions

• Nominal diameter 18″
• 457mm
• Overall diameter 466mm
• Baffle cutout diameter 430mm
• Overall depth 253mm
• Flange thickness 21mm
• Mounting depth 232mm
• Volume occupied by the driver (estimated) 7.9L
• Net weight 12.3kg
• Frame material Aluminium