Eighteen Sound 18NLW9601 8Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.9dB
• Frequency response 30 - 2300Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 39Hz
• Mechanical quality factor QMS 5.70
• Electrical quality factor QES 0.30
• Total quality factor QTS 0.28

Large signal parameters

• Maximum linear excursion xmax 14mm
• Air volume displaced at xmax VD 1582cm³
• Power handling P 1800W
• Program power Pmax 3600W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 4.7Ω
• Inductance (1kHz) LE 2.19mH
• VC Diameter 135mm
• Winding material Aluminum

Magnet

• Force factor Bl 31N/A
• Motor constant Bl/√RE 14.3N/√W
• Material Neodymium

Diaphragm

• Effective diameter 379mm
• Effective area SD 1130cm²
• Moving mass MMS 255g
• Moving mass (without air load) MMD 228g
• Material Water,UV repellent

Suspensions

• Stiffness KMS 15.4N/mm
• Compliance CMS 65µm/N
• Equivalent volume to the compliance VAS 120L
• Mechanical resistance RMS 11N·s/m

Dimensions

• Nominal diameter 18″
• 462mm
• Overall diameter 462mm
• Baffle cutout diameter 416mm
• Overall depth 236mm
• Flange thickness 26mm
• Mounting depth 210mm
• Volume occupied by the driver (estimated) 7.7L
• Net weight 12.8kg