Eminence Sigma Pro 18A

Eminence Sigma Pro 18A

Eminence

  • £153.90
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SPECIFICATION Nominal Basket Diameter 18", 457.2mm Nominal Impedance* 8 ohms Power Rating Watts 800W Music Program 1600W Resonance 25Hz Usable Frequency Range 40Hz-800Hz Sensitivity*** 97 Magnet Weight 109 oz. Gap Height 0.375", 9.53mm Voice Coil Diameter 4", 101.6mm.

THIELE & SMALL PARAMETERS  
Resonant Frequency (fs) 25Hz
 
 
 
 
DC Resistance (Re) 5.20
Coil Inductance (Le) 1.67mH
Mechanical Q (Qms) 8.18
Electromagnetic Q (Qes) 0.32
Total Q (Qts) 0.31
Compliance Equivalent Volume (Vas) 548.7 liters / 19.4 cu.ft.
Peak Diaphragm Displacement Volume (Vd) 556cc
Mechanical Compliance of Suspension (Cms) 0.29mm/N
BL Product (BL) 18.8 T-M
Diaphram Mass inc. Airload (Mms) 138 grams
Efficiency Bandwidth Product (EBP) 79
Maximum Linear Excursion (Xmax) 4.8mm
Surface Area of Cone (Sd) 1159.0 cm2  
Maximum Mechanical Limit (Xlim) 16.0mm  
     
MOUNTING INFORMATION    
Recommended Enclosure    
Sealed N/A  
Vented 96-198 liters/ 3.4-7 cu.ft.  
Overall Diameter 18", 457.2mm  
Baffle Hole Diameter 16.56", 420.5mm  
Front Sealing Gasket Fitted as standard  
Rear Sealing Gasket Fitted as standard  
Mounting Holes Diameter 0.28", 7.1mm  
Mounting Holes B.C. D. 17.25", 438.2mm  
Depth 8.15", 207mm  
Net Weight 25.2 lbs., 11.4 kg  
Shipping Weight 28.9 lbs., 13.1 kg  
     
MATERIALS OF CONSTRUCTION    
Coil Construction Copper voice coil  
Coil Former Polyimide former  
Magnet Composition Ferrite magnet  
Core Details Vented and extended core  
Basket Materials Die-cast aluminum basket  
Cone Composition Paper Cone  
Cone Edge Composition Cloth cone edge  
Dustcap Composition Solid composition paper dust cap

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