Poly damped woven glass fiber cone controls cone break-up and provides a smooth roll-off Copper cap keeps inductance under control and extends high frequency response 1" vented aluminum voice coil former and vented pole piece for high power handling High energy ferrite magnet increases BL for higher efficiency and more output Smooth response with true full-range reproduction for simple speaker designs Dayton Audio's PC105-4 4" full-range driver will deliver smooth and natural response from extremely compact designs. When used in line arrays, portable speakers, sound bars, or as a dedicated midrange in 3-way designs this driver will prove to be an excellent value.