Eminence Sigma Pro 18A

Specifications:
 

• Nominal Basket Diameter 18", 457.2mm
• Nominal Impedance* 8 ohms
• Power Rating: Watts 650W, Music Program 1300W
• Resonance 28Hz
• Usable Frequency Range 41Hz - 2.4kHz
• Sensitivity*** 99dB
• Magnet Weight 120 oz.
• Gap Height 0.37", 9.53mm
• Voice Coil Diameter 3", 76.2mm

Thiele & Small Parameters :
 

• Resonant Frequency (fs) 28Hz
• DC Resistance (Re) 6.29
• Coil Inductance (Le) 1.9mH
• Mechanical Q (Qms) 8.28
• Electromagnetic Q (Qes) 0.3
• Total Q (Qts) 0.29
• Compliance Equivalent Volume (Vas) 441.2 liters /
• 15.6 cu.ft.
• Peak Diaphragm Displacement Volume (Vd) 695cc
• Mechanical Compliance of Suspension (Cms) 0.24mm/N
• BL Product (BL) 22.1 T-M
• Diaphragm Mass Inc. Airload (MMs) 130 grams
• Efficiency Bandwidth Product (EBP) 93
• Maximum Linear Excursion (Xmax) 6.1mm
• Surface Area of Cone (Sd) 1140 cm2
• Maximum Mechanical Limit (Xlim) 18mm

Mounting Information :
 

• Driver Volume Displaced 403.9 cu.in. / 6.62 liters
• 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 24.5 lbs, 11.1 kg
• Shipping Weight 28.1 lbs, 12.8 kgs

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
• Dust Cap Composition Solid composition paper dust cap

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