Eighteen Sound 8CX650

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.7dB
• Frequency response 90 - 4700Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 65Hz
• Mechanical quality factor QMS 6.40
• Electrical quality factor QES 0.37
• Total quality factor QTS 0.35

Large signal parameters

• Maximum linear excursion xmax 6mm
• Air volume displaced at xmax VD 136cm³
• Power handling P 200W
• Program power Pmax 400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 4.9Ω
• Inductance (1kHz) LE 0.7mH
• VC Diameter 65mm
• Winding material Edgewound Aluminum

Magnet

• Force factor Bl 12N/A
• Motor constant Bl/√RE 5.42N/√W

Diaphragm

• Effective diameter 170mm
• Effective area SD 227cm²
• Moving mass MMS 25.6g
• Moving mass (without air load) MMD 23.1g

Suspensions

• Stiffness KMS 4.27N/mm
• Compliance CMS 234µm/N
• Equivalent volume to the compliance VAS 16.6L
• Mechanical resistance RMS 1.63N·s/m

Dimensions

• Nominal diameter 8″
• 200mm
• Overall diameter 210mm
• Baffle cutout diameter 185mm
• Overall depth 132mm
• Flange thickness 8mm
• Mounting depth 124mm
• Volume occupied by the driver (estimated) 1.9L
• Net weight 5.6kg