Eighteen Sound 18NLW9400

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.9dB
• Frequency response 30 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 32Hz
• Mechanical quality factor QMS 6.10
• Electrical quality factor QES 0.23
• Total quality factor QTS 0.22

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 4Ω
• DC resistance RE 2.6Ω
• Inductance (1kHz) LE 1.25mH
• VC Diameter 100mm
• Winding material Copper

Magnet

• Force factor Bl 20.5N/A
• Motor constant Bl/√RE 12.7N/√W
• Material Neodymium

Diaphragm

• Effective diameter 395mm
• Effective area SD 1225cm²
• Moving mass MMS 185g
• Moving mass (without air load) MMD 155g
• Material Weather protected

Suspensions

• Stiffness KMS 7.46N/mm
• Compliance CMS 134µm/N
• Equivalent volume to the compliance VAS 278L
• Mechanical resistance RMS 6.1N·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