Eighteen Sound 15W750 8Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.1dB
• Frequency response 50 - 4300Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 39Hz
• Mechanical quality factor QMS 9.34
• Electrical quality factor QES 0.39
• Total quality factor QTS 0.37

Large signal parameters

• Maximum linear excursion xmax 8mm
• Air volume displaced at xmax VD 680cm³
• Power handling P 600W
• Program power Pmax 1200W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.1Ω
• Inductance (1kHz) LE 1.1mH
• VC Diameter 75mm
• Winding material Aluminum

Magnet

• Force factor Bl 17.6N/A
• Motor constant Bl/√RE 7.79N/√W
• Material Ferrite

Diaphragm

• Effective diameter 329mm
• Effective area SD 850cm²
• Moving mass MMS 88g
• Moving mass (without air load) MMD 70.5g
• Material Weather protected

Suspensions

• Stiffness KMS 5.29N/mm
• Compliance CMS 189µm/N
• Equivalent volume to the compliance VAS 218L
• Mechanical resistance RMS 2.31N·s/m

Dimensions

• Nominal diameter 15″
• 380mm
• Overall diameter 393mm
• Baffle cutout diameter 354mm
• Overall depth 184mm
• Flange thickness 13mm
• Mounting depth 171mm
• Volume occupied by the driver (estimated) 4.3L
• Net weight 7.9kg