Eighteen Sound 15NLW4500

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.8dB
• Frequency response 40 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35Hz
• Mechanical quality factor QMS 6.38
• Electrical quality factor QES 0.21
• Total quality factor QTS 0.20

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 4Ω
• DC resistance RE 3.0Ω
• Inductance (1kHz) LE 1.1mH
• VC Diameter 115mm

Magnet

• Force factor Bl 24.4N/A
• Motor constant Bl/√RE 14.1N/√W

Diaphragm

• Effective diameter 335mm
• Effective area SD 881cm²
• Moving mass MMS 198g
• Moving mass (without air load) MMD 180g

Suspensions

• Stiffness KMS 9.62N/mm
• Compliance CMS 104µm/N
• Equivalent volume to the compliance VAS 126L
• Mechanical resistance RMS 6.82N·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