Eighteen Sound 6ND430 8Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 91.8dB
• Frequency response 63 - 5500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 61Hz
• Mechanical quality factor QMS 6.50
• Electrical quality factor QES 0.28
• Total quality factor QTS 0.27

Large signal parameters

• Maximum linear excursion xmax 5mm
• Air volume displaced at xmax VD 67cm³
• Power handling P 200W
• Program power Pmax 260W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.5Ω
• Inductance (1kHz) LE 0.28mH
• VC Diameter 44mm
• Winding material Aluminum

Magnet

• Force factor Bl 10N/A
• Motor constant Bl/√RE 4.26N/√W
• Material Neodymium

Diaphragm

• Effective diameter 130mm
• Effective area SD 133cm²
• Moving mass MMS 13.3g
• Moving mass (without air load) MMD 12.2g
• Material Weather protected

Suspensions

• Stiffness KMS 1.95N/mm
• Compliance CMS 512µm/N
• Equivalent volume to the compliance VAS 12.6L
• Mechanical resistance RMS 0.78N·s/m

Dimensions

• Nominal diameter 6.5″
• 152mm
• Overall diameter 162mm
• Baffle cutout diameter 148mm
• Overall depth 73mm
• Flange thickness 9mm
• Mounting depth 64mm
• Volume occupied by the driver (estimated) 0.41L
• Net weight 1.25kg