Eighteen Sound 12W500 8Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96dB
• Frequency response 50 - 6000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 46Hz
• Mechanical quality factor QMS 6.02
• Electrical quality factor QES 0.38
• Total quality factor QTS 0.36

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 212cm³
• Power handling P 350W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 1.12mH
• VC Diameter 64mm
• Winding material Aluminum

Magnet

• Force factor Bl 12.1N/A
• Motor constant Bl/√RE 5.31N/√W
• Material Ferrite

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 36.5g
• Moving mass (without air load) MMD 27.7g
• Material Weather protected

Suspensions

• Stiffness KMS 3.05N/mm
• Compliance CMS 328µm/N
• Equivalent volume to the compliance VAS 123L
• Mechanical resistance RMS 1.75N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 315mm
• Baffle cutout diameter 282mm
• Overall depth 141mm
• Flange thickness 16mm
• Mounting depth 125mm
• Volume occupied by the driver (estimated) 2.4L
• Net weight 5.2kg