Eighteen Sound 18NTLW5000 8Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.4dB
• Frequency response 30 - 1800Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 32Hz
• Mechanical quality factor QMS 8.52
• Electrical quality factor QES 0.33
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 17.5mm
• Air volume displaced at xmax VD 2023cm³
• Power handling P 1800W
• Program power Pmax 4000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.5Ω
• Inductance (1kHz) LE 1.85mH
• VC Diameter 115mm
• Winding material Aluminum

Magnet

• Force factor Bl 31.3N/A
• Motor constant Bl/√RE 13.3N/√W
• Material Neodymium

Diaphragm

• Effective diameter 384mm
• Effective area SD 1156cm²
• Moving mass MMS 295g
• Moving mass (without air load) MMD 267g
• Material Water,UV repellent

Suspensions

• Stiffness KMS 11.9N/mm
• Compliance CMS 84µm/N
• Equivalent volume to the compliance VAS 176L
• Mechanical resistance RMS 6.96N·s/m

Dimensions

• Nominal diameter 18″
• 462mm
• Overall diameter 462mm
• Baffle cutout diameter 416mm
• Overall depth 310mm
• Flange thickness 26mm
• Mounting depth 284mm
• Volume occupied by the driver (estimated) 8.8L
• Net weight 12.0kg