Eighteen Sound 15NTLW3500 8Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97dB
• Frequency response 40 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 45Hz
• Mechanical quality factor QMS 8.70
• Electrical quality factor QES 0.40
• Total quality factor QTS 0.39

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 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 0.46mH
• VC Diameter 88mm

Magnet

• Force factor Bl 19.5N/A
• Motor constant Bl/√RE 8.55N/√W
• Material Neodymium

Diaphragm

• Effective diameter 335mm
• Effective area SD 881cm²
• Moving mass MMS 106g
• Moving mass (without air load) MMD 87.8g
• Material Water,UV repellent

Suspensions

• Stiffness KMS 8.48N/mm
• Compliance CMS 118µm/N
• Equivalent volume to the compliance VAS 131L
• Mechanical resistance RMS 3.44N·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