Precision CNC-machined 220 oz. low-carbon steel motor structure
Powerful and durable double-stacked strontium ferrite magnets with a protective rubber magnet boot
Durable and attractive black oxide-treated motor structure
High-flow large diameter pole vent
High excursion motor structure and suspension design
Tall extended displacement composite foam surround
Resin-impregnated poly-cotton damper for increased cone control
Integrated tinsel leads for increased reliability and enhanced sound quality at high excursion
Mica-impregnated polypropylene hybrid cone with integrated dust cap
Attractive anti-resonance Die-cast aluminum basket
2.5 inch high-temperature Aluminum voice coils
500 Watts RMS power handling
Available with dual 2 Ohm and dual 4 Ohm voice coils for increased installation flexibility
Optimized for small sealed, vented, and bandpass enclosures
http://www.treoonline.com/infosheets/te_subwoofers.pdf or go there