Eighteen Sound 8NCX900

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.1dB
• Frequency response 100 - 23000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 130Hz
• Mechanical quality factor QMS 8.00
• Electrical quality factor QES 0.27
• Total quality factor QTS 0.26

Large signal parameters

• Maximum linear excursion xmax 3.2mm
• Maximum excursion before damage xlim 7.5mm
• Air volume displaced at xmax VD 74cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 4.9Ω
• Inductance (1kHz) LE 0.6mH
• VC Diameter 75mm
• Winding material Copper Clad Aluminum

Magnet

• Force factor Bl 19N/A
• Motor constant Bl/√RE 8.58N/√W
• Material Neodymium

Diaphragm

• Effective diameter 171mm
• Effective area SD 230cm²
• Moving mass MMS 25g
• Moving mass (without air load) MMD 22.3g
• Material Straight

Suspensions

• Stiffness KMS 18.9N/mm
• Compliance CMS 53µm/N
• Equivalent volume to the compliance VAS 4L
• Mechanical resistance RMS 2.55N·s/m
• Surround material Triple roll, Polycotton

Dimensions

• Nominal diameter 8″
• 210mm
• Overall diameter 225mm
• Baffle cutout diameter 184mm
• Overall depth 127mm
• Flange thickness 11mm
• Mounting depth 116mm
• Volume occupied by the driver (estimated) 1.7L
• Net weight 4.5kg