For all high power bass applications
Nominal Basket Diameter Impedance Power Rating Resonance Usable Frequency Range Sensitivity Magnet Weight Gap Height Voice Coil Diameter
Mounting Information Recommended Enclosure Volume (vented) Overall Diameter Baffle Hole Diameter Front Sealing Gasket Rear Sealing Gasket Mounting Holes Diameter Mounting Holes B.C.D. Depth Shipping Weight
Thiele-Small Parameters Resonant Frequency (fs) Impedance (Re) Coil Inductance (Le) Electromagnetic Q (Qes) Mechanical Q (Qms) Total Q (Qts) Compliance Equivalent Volume (Vas) Peak Diaphragm Displacement Volume (Vd) Mechanical Compliance of Suspension (Cms) BL Product (BL) Diaphragm Mass inc. Airload (Mms) Equiv. Resistance of Mechanical Suspension Loss (Rms) Efficiency Bandwidth Product (EBP) Voice Coil Overhang (Xmax) Surface Area of Cone (Sd) Impedance at Resonance (Zmax) Maximum Mechanical Limit (Xmech)
18", 457.2mm 8 ohms 650Wrms 28Hz 25Hz - 2.5kHz click here for guide 120oz.* 0.375", 9.52mm 3.0", 76.2mm
106 - 177 liters 3.75 - 6.25 cu. ft. 18", 457.2mm 16.56", 420mm fitted as standard fitted as standard 0.25", 6.4mm 17.25", 438.2mm 8.15", 207mm 27.2lbs., 12.4 kg.
28Hz 6.29 ohms 1.90mH 0.30 8.28 0.29 441.2 liters 15.58 cu. ft. 688cc 0.24mm/N 22.1 T-M 130 grams 2.81N*sec/M 95 6.0mm 1140.1cm2 180 ohms 36.45mm
Eminence response curves are measured under the following controlled test conditions:
To download spec sheets: Sigmapro18
Materials of Construction
Kapton coil former for increased rigidity and thermal protection
Polyamide-imide coated two-layer, 28ga., copper voice coil for improved power-handling and durability
Ferrite Magnet (*recently improved with a 120 oz. magnet)
Vented and extended core for increased power- handling
Die-cast aluminum basket for rigidity
Paper cone
Cloth cone edge
Solid composition paper dust cap
