SICA 18 K 4 PL

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.8dB
• Frequency response 35 - 700Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 36.8Hz
• Mechanical quality factor QMS 4.62
• Electrical quality factor QES 0.35
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 6.5mm
• Air volume displaced at xmax VD 757cm³
• Power handling P 1200W
• Program power Pmax 2400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.0Ω
• Inductance (1kHz) LE 1.6mH
• VC Diameter 100mm
• Winding height HVC 12mm
• Winding material Copper
• Former material Glass Fiber

Magnet

• Flux density B 1.21T
• Force factor Bl 26.8N/A
• Motor constant Bl/√RE 10.9N/√W
• Weight 0.536kg
• Material Neodymium

Diaphragm

• Effective diameter 385mm
• Effective area SD 1164cm²
• Moving mass MMS 179g
• Moving mass (without air load) MMD 151g
• Material Paper

Suspensions

• Stiffness KMS 9.52N/mm
• Compliance CMS 105µm/N
• Equivalent volume to the compliance VAS 201L
• Mechanical resistance RMS 8.95N·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