Eminence IMPERO 18C

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.6dB
• Frequency response 36 - 800Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 31Hz
• Mechanical quality factor QMS 10.13
• Electrical quality factor QES 0.35
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 8.1mm
• Maximum excursion before damage xlim 20.2mm
• Air volume displaced at xmax VD 942cm³
• Power handling P 1200W
• Program power Pmax 2400W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.1Ω
• Inductance (1kHz) LE 1.09mH
• VC Diameter 102mm
• Winding material Copper
• Former material Glass Fiber

Magnet

• Force factor Bl 16.1N/A
• Motor constant Bl/√RE 9.1N/√W
• Air gap height HAG 12.7mm
• Weight 3.09kg
• Material Ferrite

Diaphragm

• Effective diameter 384mm
• Effective area SD 1159cm²
• Moving mass MMS 148g
• Moving mass (without air load) MMD 120g
• Material Water resistant paper

Suspensions

• Stiffness KMS 5.88N/mm
• Compliance CMS 170µm/N
• Equivalent volume to the compliance VAS 317L
• Mechanical resistance RMS 2.85N·s/m
• Surround material Treated cloth

Dimensions

• Nominal diameter 18″
• 457mm
• Overall diameter 457mm
• Baffle cutout diameter 421mm
• Overall depth 211mm
• Volume occupied by the driver 6.7L
• Net weight 12.38kg
• Frame material Die-cast aluminum