Recommended for professional audio subwoofer and woofer applications in sealed and vented enclosures. Not for horn-loading or scoops.

• Nominal Basket Diameter 18", 457.2 mm
• Nominal Impedance 8 ohms
• Power Rating Watts 1250 W / Music Program 2500 W
• Resonance 33 Hz
• Usable Frequency Range 33 Hz - 600 Hz
• Sensitivity 95.5
• Magnet Weight 109 oz.
• Gap Height 0.375", 9.53 mm
• Voice Coil Diameter 4", 101.6 mm

• Resonant Frequency (fs) 33 Hz
• DC Resistance (Re) 5.84
• Coil Inductance (Le) 2.38 mH
• Mechanical Q (Qms) 14.24
• Electromagnetic Q (Qes) 0.58
• Total Q (Qts) 0.56
• Compliance Equivalent Volume (Vas) 239.9 liters / 8.5 cu. ft.
• Peak Diaphragm Displacement Volume (Vd) 1136 cc
• Mechanical Compliance of Suspension (Cms) 0.13 mm/N
• BL Product (BL) 19.7 T-M
• Diaphragm Mass inc. Airload (Mms) 186 grams
• Efficiency Bandwidth Product (EBP) 57
• Maximum Linear Excursion (Xmax) 9.8 mm
• Surface Area of Cone (Sd) 1159.0 cm²
• Maximum Mechanical Limit (Xlim) 19.1 mm

• Recommended Enclosure Volume
  Sealed 133-147 liters/4.7-5.2 cu. ft.
  Vented 144-258 liters/5.1-9.1 cu. ft.
• Overall Diameter 18", 457.2 mm
• Baffle Hole Diameter 16.56", 420.6 mm
• Front Sealing Gasket fitted as standard
• Rear Sealing Gasket fitted as standard
• Mounting Holes Diameter 0.25", 6.4 mm
• Mounting Holes B.C.D. 17.25", 438.2 mm
• Depth 8.15", 207 mm

• Copper voice coil
• Polyimide former
• Ferrite magnet
• Extended core with Core Periphery Ventilation
• Die-cast aluminum basket
• Paper Cone
• Cloth cone edge
• Porous cloth top spider/ heatsink