Eighteen Sound 6ND410 16Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.7dB
• Frequency response 200 - 8000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 149Hz
• Mechanical quality factor QMS 4.14
• Electrical quality factor QES 0.55
• Total quality factor QTS 0.48

Large signal parameters

• Maximum linear excursion xmax 2mm
• Air volume displaced at xmax VD 29cm³
• Power handling P 180W
• Program power Pmax 240W

Voice Coil

• Nominal impedance Z 16Ω
• DC resistance RE 10.6Ω
• Inductance (1kHz) LE 0.14mH
• VC Diameter 44mm
• Winding material Aluminum

Magnet

• Force factor Bl 13N/A
• Motor constant Bl/√RE 3.99N/√W
• Material Neodymium

Diaphragm

• Effective diameter 135mm
• Effective area SD 143cm²
• Moving mass MMS 8.8g
• Moving mass (without air load) MMD 7.6g
• Material Weather protected

Suspensions

• Stiffness KMS 7.69N/mm
• Compliance CMS 130µm/N
• Equivalent volume to the compliance VAS 6.2L
• Mechanical resistance RMS 1.99N·s/m

Dimensions

• Nominal diameter 6.5″
• 152mm
• Overall diameter 162mm
• Baffle cutout diameter 148mm
• Overall depth 60mm
• Flange thickness 9mm
• Mounting depth 51mm
• Volume occupied by the driver (estimated) 0.36L
• Net weight 1.25kg