Recommended for professional audio in both sealed and vented enclosures. Ideal for full-range, mid/hi, and monitor wedges.
SPECIFICATION Nominal Basket Diameter 18", 457 mm Nominal Impedance 8 ohms Power Rating Watts 500 W / Music Program 1000 W Resonance 28 Hz Usable Frequency Range 37 Hz - 250 Hz Sensitivity 96 Magnet Weight 67 oz. Gap Height 0.38", 9.53 mm Voice Coil Diameter 2.5", 63.5 mm
THIELE & Small Parameters Resonant Frequency (fs) 28 Hz DC Resistance (Re) 5.3 Coil Inductance (Le) 3.43 mH 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) 796.00 cc Mechanical Compliance of Suspension (Cms) 0.25 mm/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) 6.7 mm Surface Area of Cone (Sd) 1188.0 cm² Maximum Mechanical Limit (Xlim) 15.0 mm
MOUNTING Information Recommended Enclosure Volume Sealed N/A Vented 85-297 liters/3.0-10.5 cu. ft. Overall Diameter 18.00", 457.20 mm Baffle Hole Diameter 16.57", 420.88 mm Front Sealing Gasket fitted as standard Rear Sealing Gasket fitted as standard Mounting Holes Diameter 0.28", 7.11 mm Mounting Holes B.C.D. 17.25", 438.15 mm Depth 8.13", 206.50 mm
MATERIALS of Construction 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