Eighteen Sound 18NLW9601C

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.5dB
• Frequency response 30 - 2300Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 38.5Hz
• Mechanical quality factor QMS 6.29
• Electrical quality factor QES 0.36
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 14mm
• Maximum excursion before damage xlim 35mm
• 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 1.8mH
• VC Diameter 135mm
• Winding material Aluminum

Magnet

• Force factor Bl 31.7N/A
• Motor constant Bl/√RE 14.6N/√W

Diaphragm

• Effective diameter 379mm
• Effective area SD 1130cm²
• Moving mass MMS 314g
• Moving mass (without air load) MMD 287g
• Material Carbon Fiber

Suspensions

• Stiffness KMS 18.2N/mm
• Compliance CMS 55µm/N
• Equivalent volume to the compliance VAS 99L
• Mechanical resistance RMS 12.1N·s/m
• Surround material Heavy Polycotton

Dimensions

• Nominal diameter 18″
• 462mm
• Overall diameter 462mm
• Baffle cutout diameter 422mm
• Overall depth 236mm
• Flange thickness 26mm
• Mounting depth 210mm
• Volume occupied by the driver (estimated) 7.7L
• Net weight 12.8kg