Eighteen Sound 18NLW9000 8Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.2dB
• Frequency response 32 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 34Hz
• Mechanical quality factor QMS 7.00
• Electrical quality factor QES 0.32
• Total quality factor QTS 0.31

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 8Ω
• DC resistance RE 5.5Ω
• Inductance (1kHz) LE 1.9mH
• VC Diameter 135mm

Magnet

• Force factor Bl 28N/A
• Motor constant Bl/√RE 11.9N/√W

Diaphragm

• Effective diameter 394mm
• Effective area SD 1222cm²
• Moving mass MMS 218g
• Moving mass (without air load) MMD 188g

Suspensions

• Stiffness KMS 9.9N/mm
• Compliance CMS 101µm/N
• Equivalent volume to the compliance VAS 206L
• Mechanical resistance RMS 6.65N·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