RCF LF18N405

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.7dB
• Frequency response 30 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 30Hz
• Mechanical quality factor QMS 7.00
• Electrical quality factor QES 0.34
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 14mm
• Maximum excursion before damage xlim 29mm
• Air volume displaced at xmax VD 1680cm³
• Power handling P 1500W
• Program power Pmax 3000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 4.9Ω
• Inductance (1kHz) LE 1.7mH
• VC Diameter 102mm
• Winding height HVC 36mm
• Winding material Copper

Magnet

• Force factor Bl 26.5N/A
• Motor constant Bl/√RE 12N/√W
• Air gap height HAG 15mm

Diaphragm

• Effective diameter 395mm
• Effective area SD 1200cm²
• Moving mass MMS 261g
• Moving mass (without air load) MMD 232g

Suspensions

• Stiffness KMS 9.17N/mm
• Compliance CMS 109µm/N
• Equivalent volume to the compliance VAS 227L
• Mechanical resistance RMS 7.03N·s/m

Dimensions

• Nominal diameter 18″
• 457mm
• Overall diameter 465mm
• Baffle cutout diameter 425mm
• Overall depth 208mm
• Volume occupied by the driver 5.5L
• Net weight 8.8kg