Eighteen Sound 6ND410

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.8dB
• Frequency response 200 - 8000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 120Hz
• Mechanical quality factor QMS 2.20
• Electrical quality factor QES 0.27
• Total quality factor QTS 0.24

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 8Ω
• DC resistance RE 5.9Ω
• Inductance (1kHz) LE 0.67mH
• VC Diameter 44mm
• Winding material Aluminum

Magnet

• Force factor Bl 11.6N/A
• Motor constant Bl/√RE 4.78N/√W
• Material Neodymium

Diaphragm

• Effective diameter 135mm
• Effective area SD 143cm²
• Moving mass MMS 8.2g
• Moving mass (without air load) MMD 7g
• Material Weather protected

Suspensions

• Stiffness KMS 4.65N/mm
• Compliance CMS 215µm/N
• Equivalent volume to the compliance VAS 6.2L
• Mechanical resistance RMS 2.81N·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