The CarbonX Woofer is constructed from dry carbon impregnated paper. This unique material is very lightweight but incredibly stiff. The benefit is increased power handling, pronounced mid-range, and exceptional bass extension. The surround is the suspension of every speaker. The problem is that most surrounds get in the way of the actual sound that leaves the speakers cone. The Blue Label Silhouette surround smoothly transitions into the CarbonX woofer for smoother frequency response which results in a pure, clean sound.