Eminence DEFINIMAX 4018LF

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.3dB
• Frequency response 31 - 200Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 30Hz
• Mechanical quality factor QMS 11.95
• Electrical quality factor QES 0.35
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 8.6mm
• Maximum excursion before damage xlim 15.9mm
• Air volume displaced at xmax VD 1018cm³
• Power handling P 1200W
• Program power Pmax 2400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.1Ω
• Inductance (1kHz) LE 4.54mH
• VC Diameter 101.6mm
• Winding material Copper
• Former material Polyimide

Magnet

• Force factor Bl 26.8N/A
• Motor constant Bl/√RE 10.8N/√W
• Air gap height HAG 9.5mm
• Weight 3.09kg
• Material Ferrite

Diaphragm

• Effective diameter 389mm
• Effective area SD 1188cm²
• Moving mass MMS 217g
• Moving mass (without air load) MMD 189g
• Material Water resistant paper

Suspensions

• Stiffness KMS 7.69N/mm
• Compliance CMS 130µm/N
• Equivalent volume to the compliance VAS 255L
• Mechanical resistance RMS 3.42N·s/m
• Surround material Cloth

Dimensions

• Nominal diameter 18″
• 457mm
• Overall diameter 457mm
• Baffle cutout diameter 421mm
• Overall depth 207mm
• Volume occupied by the driver 6.63L
• Net weight 10.886kg
• Frame material Die-cast Aluminium