Eighteen Sound 15NLW4500 8Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.9dB
• Frequency response 40 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35Hz
• Mechanical quality factor QMS 7.80
• Electrical quality factor QES 0.27
• Total quality factor QTS 0.26

Large signal parameters

• Maximum linear excursion xmax 14.5mm
• Air volume displaced at xmax VD 1278cm³
• Power handling P 1500W
• Program power Pmax 3000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.4Ω
• Inductance (1kHz) LE 1.62mH
• VC Diameter 115mm

Magnet

• Force factor Bl 29.7N/A
• Motor constant Bl/√RE 12.8N/√W

Diaphragm

• Effective diameter 335mm
• Effective area SD 881cm²
• Moving mass MMS 201g
• Moving mass (without air load) MMD 183g

Suspensions

• Stiffness KMS 9.71N/mm
• Compliance CMS 103µm/N
• Equivalent volume to the compliance VAS 111L
• Mechanical resistance RMS 5.67N·s/m

Dimensions

• Nominal diameter 15″
• 393mm
• Overall diameter 393mm
• Baffle cutout diameter 356mm
• Overall depth 199mm
• Flange thickness 15mm
• Mounting depth 184mm
• Volume occupied by the driver (estimated) 5.8L
• Net weight 11.4kg