Eighteen Sound 8NW650

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.7dB
• Frequency response 55 - 6300Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 63Hz
• Mechanical quality factor QMS 3.70
• Electrical quality factor QES 0.27
• Total quality factor QTS 0.25

Large signal parameters

• Maximum linear excursion xmax 5.5mm
• Air volume displaced at xmax VD 127cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.1Ω
• Inductance (1kHz) LE 0.71mH
• VC Diameter 65mm
• Winding material Aluminum

Magnet

• Force factor Bl 15.2N/A
• Motor constant Bl/√RE 6.15N/√W
• Material Neodymium

Diaphragm

• Effective diameter 171mm
• Effective area SD 230cm²
• Moving mass MMS 26g
• Moving mass (without air load) MMD 23.5g
• Material Weather protected

Suspensions

• Stiffness KMS 4.08N/mm
• Compliance CMS 245µm/N
• Equivalent volume to the compliance VAS 17.8L
• Mechanical resistance RMS 2.78N·s/m

Dimensions

• Nominal diameter 8″
• 200mm
• Overall diameter 210mm
• Baffle cutout diameter 185mm
• Overall depth 111mm
• Flange thickness 8mm
• Mounting depth 103mm
• Volume occupied by the driver (estimated) 0.97L
• Net weight 2.4kg