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SIGMA PRO 18A-2 Professional Series
Recommended for professional audio as a woofer in vented enclosures.
SPECIFICATION
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Nominal Basket Diameter 18", 457.2mm
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Nominal Impedance* 8 ohms
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Power Rating** Watts 650W / Music Program 1300W
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Resonance 28Hz
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Usable Frequency Range*** 41Hz-2.4kHz
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Sensitivity 99
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Magnet Weight 120 oz.
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Gap Height 0.375", 9.53mm
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Voice Coil Diameter 3", 76.2mm
THIELE & Small Parameters
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Resonant Frequency (fs) 28Hz
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DC Resistance (Re) 6.29
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Coil Inductance (Le) 1.90mH
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Mechanical Q (Qms) 8.28
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Electromagnetic Q (Qes) 0.30
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Total Q (Qts) 0.29
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Compliance Equivalent Volume (Vas) 441.2 liters / 15.6 cu. ft.
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Peak Diaphragm Displacement Volume 695cc
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Mechanical Compliance of Suspension (Cms) 0.24mm/N
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BL Product (BL) 22.1 T-M
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Diaphragm Mass inc. Airload (Mms) 130 grams
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Efficiency Bandwidth Product (EBP) 93
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Maximum Linear Excursion (Xmax) 6.1mm
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Surface Area of Cone (Sd) 1140.0 cm2
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Maximum Mechanical Limit (Xlim) 18.0mm
MOUNTING Information
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Recommended Enclosure Volume
Sealed N/A
Vented 93-212 liters/3.3-7.5 cu.ft.
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Overall Diameter 18", 457.2mm
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Baffle Hole Diameter 16.56", 420.5mm
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Front Sealing Gasket fitted as standard
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Rear Sealing Gasket fitted as standard
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Mounting Holes Diameter 0.28", 7.1mm
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Mounting Holes B.C.D. 17.25", 438.2mm
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Depth 8.15", 207mm
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Net Weight 24.5 lbs., 11.1 kg
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Shipping Weight 28.1 lbs., 12.8 kg
MATERIALS of Construction
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Copper voice coil
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Polyimide former
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Ferrite magnet
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Vented and extended core
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Die-cast aluminum basket
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Paper Cone
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Cloth cone edge
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Solid composition paper dust cap
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