SICA 18 S 4 CP

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.3dB
• Frequency response 30 - 700Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 33Hz
• Mechanical quality factor QMS 3.94
• Electrical quality factor QES 0.39
• Total quality factor QTS 0.35

Large signal parameters

• Maximum linear excursion xmax 11mm
• Air volume displaced at xmax VD 1281cm³
• Power handling P 1200W
• Program power Pmax 2400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 1.81mH
• VC Diameter 100mm
• Winding height HVC 12mm
• Winding material Copper
• Former material Glass Fiber

Magnet

• Flux density B 1.15T
• Force factor Bl 23.5N/A
• Motor constant Bl/√RE 10.3N/√W
• Weight 3.3kg
• Material Ferrite

Diaphragm

• Effective diameter 385mm
• Effective area SD 1164cm²
• Moving mass MMS 199g
• Moving mass (without air load) MMD 170g
• Material Paper

Suspensions

• Stiffness KMS 8.55N/mm
• Compliance CMS 117µm/N
• Equivalent volume to the compliance VAS 225L
• Mechanical resistance RMS 10.5N·s/m
• Surround material Treated Cloth

Dimensions

• Nominal diameter 18″
• 463mm
• Overall diameter 462mm
• Baffle cutout diameter 417mm
• Overall depth 204mm
• Volume occupied by the driver (estimated) 7.5L
• Net weight 14.2kg
• Frame material Aluminium Die-Cast