Eighteen Sound 8CX401F

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.1dB
• Frequency response 65 - 6100Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 56Hz
• Mechanical quality factor QMS 3.23
• Electrical quality factor QES 0.38
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 5.8mm
• Air volume displaced at xmax VD 132cm³
• Power handling P 280W
• Program power Pmax 400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.0Ω
• Inductance (1kHz) LE 0.96mH
• VC Diameter 51mm
• Winding material ISV Aluminum
• Former material Fiberglas

Magnet

• Force factor Bl 9.3N/A
• Motor constant Bl/√RE 4.16N/√W
• Material Ferrite

Diaphragm

• Effective diameter 170mm
• Effective area SD 227cm²
• Moving mass MMS 18g
• Moving mass (without air load) MMD 15.5g
• Material Humidity repellent

Suspensions

• Stiffness KMS 2.23N/mm
• Compliance CMS 449µm/N
• Equivalent volume to the compliance VAS 23.9L
• Mechanical resistance RMS 1.96N·s/m

Dimensions

• Nominal diameter 8″
• 200mm
• Overall diameter 210mm
• Baffle cutout diameter 186mm
• Overall depth 150mm
• Flange thickness 14mm
• Mounting depth 136mm
• Volume occupied by the driver (estimated) 1.7L
• Net weight 4.4kg