Eighteen Sound 15NLW9500 8Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.1dB
• Frequency response 42 - 2000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35Hz
• Mechanical quality factor QMS 6.70
• Electrical quality factor QES 0.34
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 9mm
• Air volume displaced at xmax VD 765cm³
• Power handling P 1000W
• Program power Pmax 1400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 4.9Ω
• Inductance (1kHz) LE 0.8mH
• VC Diameter 100mm
• Winding material Copper

Magnet

• Force factor Bl 21.6N/A
• Motor constant Bl/√RE 9.76N/√W
• Material Neodymium

Diaphragm

• Effective diameter 329mm
• Effective area SD 850cm²
• Moving mass MMS 146g
• Moving mass (without air load) MMD 129g
• Material Weather protected

Suspensions

• Stiffness KMS 7.04N/mm
• Compliance CMS 142µm/N
• Equivalent volume to the compliance VAS 163L
• Mechanical resistance RMS 4.79N·s/m

Dimensions

• Nominal diameter 15″
• 380mm
• Overall diameter 387mm
• Baffle cutout diameter 353mm
• Overall depth 177mm
• Flange thickness 24mm
• Mounting depth 153mm
• Volume occupied by the driver (estimated) 3.9L
• Net weight 7.0kg