Eighteen Sound 12ND710 16Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 98.7dB
• Frequency response 61 - 5500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 53Hz
• Mechanical quality factor QMS 4.00
• Electrical quality factor QES 0.31
• Total quality factor QTS 0.29

Large signal parameters

• Maximum linear excursion xmax 5mm
• Air volume displaced at xmax VD 265cm³
• Power handling P 450W
• Program power Pmax 700W

Voice Coil

• Nominal impedance Z 16Ω
• DC resistance RE 9.4Ω
• Inductance (1kHz) LE 0.74mH
• VC Diameter 75mm

Magnet

• Force factor Bl 20.3N/A
• Motor constant Bl/√RE 6.62N/√W
• Material Neodymium

Diaphragm

• Effective diameter 260mm
• Effective area SD 530cm²
• Moving mass MMS 41g
• Moving mass (without air load) MMD 32.3g
• Material Weather protected

Suspensions

• Stiffness KMS 4.55N/mm
• Compliance CMS 220µm/N
• Equivalent volume to the compliance VAS 85L
• Mechanical resistance RMS 3.41N·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) 2.2L
• Net weight 4.4kg