SICA 18 S 4 PL

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.5dB
• Frequency response 35 - 700Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 36.2Hz
• Mechanical quality factor QMS 6.56
• Electrical quality factor QES 0.42
• Total quality factor QTS 0.39

Large signal parameters

• Maximum linear excursion xmax 8mm
• Air volume displaced at xmax VD 931cm³
• Power handling P 1200W
• Program power Pmax 2400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 1.35mH
• VC Diameter 100mm
• Winding height HVC 12mm
• Winding material Copper
• Former material Glass Fiber

Magnet

• Flux density B 1.21T
• Force factor Bl 23.5N/A
• Motor constant Bl/√RE 10.3N/√W
• Weight 0.536kg
• Material Neodymium

Diaphragm

• Effective diameter 385mm
• Effective area SD 1164cm²
• Moving mass MMS 197g
• Moving mass (without air load) MMD 169g
• Material Paper

Suspensions

• Stiffness KMS 10.2N/mm
• Compliance CMS 98µm/N
• Equivalent volume to the compliance VAS 189L
• Mechanical resistance RMS 6.83N·s/m
• Surround material Treated Cloth

Dimensions

• Nominal diameter 18″
• 462mm
• Overall diameter 462mm
• Baffle cutout diameter 417mm
• Overall depth 211mm
• Volume occupied by the driver (estimated) 5.4L
• Net weight 8.3kg
• Frame material Aluminium Die-Cast