Eighteen Sound 18NLW4000

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.6dB
• Frequency response 30 - 1800Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 34Hz
• Mechanical quality factor QMS 22.00
• Electrical quality factor QES 0.34
• Total quality factor QTS 0.33

Large signal parameters

• Maximum linear excursion xmax 15mm
• Air volume displaced at xmax VD 1695cm³
• Power handling P 1500W
• Program power Pmax 3200W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 4.9Ω
• Inductance (1kHz) LE 2.8mH
• VC Diameter 100mm
• Winding material Copper

Magnet

• Force factor Bl 30N/A
• Motor constant Bl/√RE 13.6N/√W
• Material Neodymium

Diaphragm

• Effective diameter 379mm
• Effective area SD 1130cm²
• Moving mass MMS 290g
• Moving mass (without air load) MMD 263g
• Material Water,UV repellent

Suspensions

• Stiffness KMS 13.2N/mm
• Compliance CMS 76µm/N
• Equivalent volume to the compliance VAS 135L
• Mechanical resistance RMS 2.82N·s/m

Dimensions

• Nominal diameter 18″
• 462mm
• Overall diameter 462mm
• Baffle cutout diameter 416mm
• Overall depth 227mm
• Flange thickness 26mm
• Mounting depth 201mm
• Volume occupied by the driver (estimated) 6.3L
• Net weight 9.8kg