Eighteen Sound 12ND610 16Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 99.9dB
• Frequency response 80 - 5000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 50Hz
• Mechanical quality factor QMS 4.56
• Electrical quality factor QES 0.22
• Total quality factor QTS 0.21

Large signal parameters

• Maximum linear excursion xmax 3.5mm
• Air volume displaced at xmax VD 186cm³
• Power handling P 450W
• Program power Pmax 700W

Voice Coil

• Nominal impedance Z 16Ω
• DC resistance RE 11.9Ω
• Inductance (1kHz) LE 0.76mH
• VC Diameter 75mm
• Winding material Aluminum

Magnet

• Force factor Bl 27.9N/A
• Motor constant Bl/√RE 8.09N/√W
• Material Neodymium

Diaphragm

• Effective diameter 260mm
• Effective area SD 530cm²
• Moving mass MMS 45g
• Moving mass (without air load) MMD 36.3g
• Material Weather protected

Suspensions

• Stiffness KMS 4.44N/mm
• Compliance CMS 225µm/N
• Equivalent volume to the compliance VAS 85L
• Mechanical resistance RMS 3.1N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 315mm
• Baffle cutout diameter 282mm
• Overall depth 141mm
• Flange thickness 11mm
• Mounting depth 130mm
• Volume occupied by the driver (estimated) 2.3L
• Net weight 4.7kg