Eighteen Sound 15W500

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97dB
• Frequency response 50 - 4500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 50Hz
• Mechanical quality factor QMS 9.64
• Electrical quality factor QES 0.55
• Total quality factor QTS 0.52

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 340cm³
• Power handling P 350W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 1.04mH
• VC Diameter 65mm
• Winding material Aluminum

Magnet

• Force factor Bl 12.6N/A
• Motor constant Bl/√RE 5.53N/√W
• Material Ferrite

Diaphragm

• Effective diameter 329mm
• Effective area SD 850cm²
• Moving mass MMS 55g
• Moving mass (without air load) MMD 37.7g

Suspensions

• Stiffness KMS 5.44N/mm
• Compliance CMS 184µm/N
• Equivalent volume to the compliance VAS 189L
• Mechanical resistance RMS 1.79N·s/m

Dimensions

• Nominal diameter 15″
• 380mm
• Overall diameter 387mm
• Baffle cutout diameter 353mm
• Overall depth 161mm
• Flange thickness 11mm
• Mounting depth 150mm
• Volume occupied by the driver (estimated) 2.7L
• Net weight 4.3kg