Eighteen Sound 18NLW9601

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.3dB
• Frequency response 30 - 2300Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 38Hz
• Mechanical quality factor QMS 6.00
• Electrical quality factor QES 0.29
• Total quality factor QTS 0.28

Large signal parameters

• Maximum linear excursion xmax 14mm
• Air volume displaced at xmax VD 1813cm³
• Power handling P 1800W
• Program power Pmax 3600W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 2.7Ω
• Inductance (1kHz) LE 1.53mH
• VC Diameter 135mm
• Winding material Aluminum

Magnet

• Force factor Bl 25N/A
• Motor constant Bl/√RE 15.2N/√W
• Material Neodymium

Diaphragm

• Effective diameter 406mm
• Effective area SD 1295cm²
• Moving mass MMS 255g
• Moving mass (without air load) MMD 224g

Suspensions

• Stiffness KMS 14.5N/mm
• Compliance CMS 69µm/N
• Equivalent volume to the compliance VAS 111L
• Mechanical resistance RMS 10.2N·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