Eighteen Sound 12W500

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.8dB
• Frequency response 50 - 6000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 49Hz
• Mechanical quality factor QMS 6.10
• Electrical quality factor QES 0.37
• Total quality factor QTS 0.35

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 4Ω
• DC resistance RE 2.7Ω
• Inductance (1kHz) LE 0.67mH
• VC Diameter 64mm

Magnet

• Force factor Bl 9.6N/A
• Motor constant Bl/√RE 5.84N/√W

Diaphragm

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

Suspensions

• Stiffness KMS 3.46N/mm
• Compliance CMS 289µm/N
• Equivalent volume to the compliance VAS 101L
• Mechanical resistance RMS 1.84N·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