Eighteen Sound 18NLW9000

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.3dB
• Frequency response 32 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 32Hz
• Mechanical quality factor QMS 5.00
• Electrical quality factor QES 0.22
• Total quality factor QTS 0.21

Large signal parameters

• Maximum linear excursion xmax 14mm
• Air volume displaced at xmax VD 1711cm³
• Power handling P 1800W
• Program power Pmax 3600W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.1Ω
• Inductance (1kHz) LE 1.2mH
• VC Diameter 135mm

Magnet

• Force factor Bl 25N/A
• Motor constant Bl/√RE 14.2N/√W
• Material Neodymium

Diaphragm

• Effective diameter 394mm
• Effective area SD 1222cm²
• Moving mass MMS 228g
• Moving mass (without air load) MMD 198g
• Material Weather protected

Suspensions

• Stiffness KMS 9.26N/mm
• Compliance CMS 108µm/N
• Equivalent volume to the compliance VAS 247L
• Mechanical resistance RMS 9.17N·s/m

Dimensions

• Nominal diameter 18″
• 462mm
• Overall diameter 462mm
• Baffle cutout diameter 422mm
• Overall depth 237mm
• Flange thickness 26mm
• Mounting depth 211mm
• Volume occupied by the driver (estimated) 7.6L
• Net weight 12.5kg