SICA 18 PF 4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.7dB
• Frequency response 35 - 700Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 38Hz
• Mechanical quality factor QMS 6.46
• Electrical quality factor QES 0.47
• Total quality factor QTS 0.43

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 1.85mH
• VC Diameter 100mm
• Winding height HVC 12mm
• Winding material Copper
• Former material Glass Fiber

Magnet

• Flux density B 1.05T
• Force factor Bl 24.6N/A
• Motor constant Bl/√RE 10.8N/√W
• Weight 3.3kg
• Material Ferrite

Diaphragm

• Effective diameter 385mm
• Effective area SD 1164cm²
• Moving mass MMS 229g
• Moving mass (without air load) MMD 201g
• Material Paper

Suspensions

• Stiffness KMS 13.2N/mm
• Compliance CMS 76µm/N
• Equivalent volume to the compliance VAS 147L
• Mechanical resistance RMS 8.47N·s/m
• Surround material Treated Cloth

Dimensions

• Nominal diameter 18″
• 463mm
• Overall diameter 462mm
• Baffle cutout diameter 417mm
• Overall depth 210mm
• Volume occupied by the driver (estimated) 7.2L
• Net weight 13.0kg
• Frame material Aluminium Die-Cast