Eminence DELTA PRO-18C

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.7dB
• Frequency response 35 - 200Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 27Hz
• Mechanical quality factor QMS 13.24
• Electrical quality factor QES 0.32
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 6.7mm
• Maximum excursion before damage xlim 15mm
• Air volume displaced at xmax VD 796cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.8Ω
• Inductance (1kHz) LE 2.65mH
• VC Diameter 64mm
• Winding material Copper
• Former material Polyimide

Magnet

• Force factor Bl 16.5N/A
• Motor constant Bl/√RE 8.46N/√W
• Air gap height HAG 9.7mm
• Weight 1.899kg
• Material Ferrite

Diaphragm

• Effective diameter 389mm
• Effective area SD 1188cm²
• Moving mass MMS 137g
• Moving mass (without air load) MMD 109g
• Material Paper

Suspensions

• Stiffness KMS 4N/mm
• Compliance CMS 250µm/N
• Equivalent volume to the compliance VAS 489L
• Mechanical resistance RMS 1.76N·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 6.01L
• Net weight 7.71kg
• Frame material Die-cast aluminum