Here are some of the features of the Pyramid PW1586X:
New Pattern Strong Black Paper Cone
Wide Heavy Foam Surround
Rigid Powder Coated Stamped Steel Basket
Bumped & Vented Pole Piece With Rubber Gasket & Rubber Magnet Boot
2.5'' 4-layer Kapton Voice Coil
110 oz. Magnet
600W RMS/1200W Peak
SPL (1W/1M): 89.5dB
4 Ohm Impedance
Overall Diameter: 15.47''
Mounting Depth: 6.14''