Eighteen Sound 18NLW9400 8Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.4dB
• Frequency response 30 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 33Hz
• Mechanical quality factor QMS 6.10
• Electrical quality factor QES 0.28
• Total quality factor QTS 0.26

Large signal parameters

• Maximum linear excursion xmax 9.5mm
• Air volume displaced at xmax VD 1164cm³
• Power handling P 1200W
• Program power Pmax 2400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.0Ω
• Inductance (1kHz) LE 1.9mH
• VC Diameter 100mm

Magnet

• Force factor Bl 26N/A
• Motor constant Bl/√RE 11.6N/√W

Diaphragm

• Effective diameter 395mm
• Effective area SD 1225cm²
• Moving mass MMS 180g
• Moving mass (without air load) MMD 150g

Suspensions

• Stiffness KMS 7.75N/mm
• Compliance CMS 129µm/N
• Equivalent volume to the compliance VAS 268L
• Mechanical resistance RMS 6.12N·s/m

Dimensions

• Nominal diameter 18″
• 462mm
• Overall diameter 462mm
• Baffle cutout diameter 416mm
• Overall depth 223mm
• Flange thickness 21mm
• Mounting depth 202mm
• Volume occupied by the driver (estimated) 5.8L
• Net weight 8.7kg