Recommended for professional audio in both sealed and vented enclosures. Ideal for full-range, mid/hi, and
monitor wedges.

• Nominal Basket Diameter 18", 457mm
• Nominal Impedance* 4 ohms
• Power Rating** Watts 500W / Music Program 1000W
• Resonance 28Hz
• Usable Frequency Range*** 37Hz-250Hz
• Sensitivity 96
• Magnet Weight 67 oz.
• Gap Height 0.38", 9.53mm
• Voice Coil Diameter 2.5", 63.5mm 

• Resonant Frequency (fs) 28Hz
• DC Resistance (Re) 5.3
• Coil Inductance (Le) 3.43mH
• Mechanical Q (Qms) 10.38
• Electromagnetic Q (Qes) 0.33
• Total Q (Qts) 0.32
• Compliance Equivalent Volume (Vas) 493.19 liters / 17.41 cu. ft.
• Peak Diaphragm Displacement Volume (Vd) 796.00cc
• Mechanical Compliance of Suspension (Cms) 0.25mm/N
• BL Product (BL) 18.9 T-M
• Diaphragm Mass inc. Airload (Mms) 128.1 grams
• Efficiency Bandwidth Product (EBP) 84
• Maximum Linear Excursion (Xmax) 6.7mm
• Surface Area of Cone (Sd) 1188.0 cm²
• Maximum Mechanical Limit (Xlim) 15.0mm 

• Recommended Enclosure Volume
  Sealed N/A
  Vented 85-297 liters/3.0-10.5 cu. ft.
• Overall Diameter 18.00", 457.20mm
• Baffle Hole Diameter 16.57", 420.88mm
• Front Sealing Gasket fitted as standard
• Rear Sealing Gasket fitted as standard
• Mounting Holes Diameter 0.28", 7.11mm
• Mounting Holes B.C.D. 17.25", 438.15mm
• Depth 8.13", 206.50mm
• Net Weight 17.00 lbs., 7.71kg
• Shipping Weight 20.5 lbs., 9.3 kg 

• Copper voice coil
• Polyimide former
• Ferrite magnet
• Vented and extended core
• Die-cast aluminum basket
• Paper Cone
• Cloth cone edge
• Solid composition paper dust cap