Eighteen Sound 15NLW9401 8Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.3dB
• Frequency response 37 - 2300Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 39Hz
• Mechanical quality factor QMS 4.13
• Electrical quality factor QES 0.28
• Total quality factor QTS 0.26

Large signal parameters

• Maximum linear excursion xmax 10mm
• Air volume displaced at xmax VD 850cm³
• Power handling P 1200W
• Program power Pmax 2400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 1.9mH
• VC Diameter 100mm
• Winding material Copper

Magnet

• Force factor Bl 25.4N/A
• Motor constant Bl/√RE 11.1N/√W
• Material Neodymium

Diaphragm

• Effective diameter 329mm
• Effective area SD 850cm²
• Moving mass MMS 140g
• Moving mass (without air load) MMD 123g
• Material Water,UV repellent

Suspensions

• Stiffness KMS 8.4N/mm
• Compliance CMS 119µm/N
• Equivalent volume to the compliance VAS 134L
• Mechanical resistance RMS 8.31N·s/m

Dimensions

• Nominal diameter 15″
• 380mm
• Overall diameter 393mm
• Baffle cutout diameter 354mm
• Overall depth 180mm
• Flange thickness 12mm
• Mounting depth 168mm
• Volume occupied by the driver (estimated) 4.1L
• Net weight 7.5kg