Eighteen Sound 15NTLW3500

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.6dB
• Frequency response 40 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 46Hz
• Mechanical quality factor QMS 9.40
• Electrical quality factor QES 0.41
• Total quality factor QTS 0.40

Large signal parameters

• Maximum linear excursion xmax 8.3mm
• Air volume displaced at xmax VD 731cm³
• Power handling P 900W
• Program power Pmax 1800W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.1Ω
• Inductance (1kHz) LE 0.29mH
• VC Diameter 88mm
• Winding material Aluminum

Magnet

• Force factor Bl 15.8N/A
• Motor constant Bl/√RE 8.97N/√W
• Material Neodymium

Diaphragm

• Effective diameter 335mm
• Effective area SD 881cm²
• Moving mass MMS 115g
• Moving mass (without air load) MMD 96.8g
• Material Weather protected

Suspensions

• Stiffness KMS 9.62N/mm
• Compliance CMS 104µm/N
• Equivalent volume to the compliance VAS 115L
• Mechanical resistance RMS 3.54N·s/m

Dimensions

• Nominal diameter 15″
• 393mm
• Overall diameter 393mm
• Baffle cutout diameter 357mm
• Overall depth 229mm
• Flange thickness 13mm
• Mounting depth 216mm
• Volume occupied by the driver (estimated) 3.8L
• Net weight 5.1kg