The TS-C520PRS 5-1/4" Premier PRS component speaker package features 3-Layer IMX (Injection Molded Matrix) Composite cone woofers for exceptional sound quality, high density micro fiber surround for smoother response and 1-1/8" lightweight soft dome tweeters.The PRS speakers come with woofers featuring 2nd generation multi-layer cones. These are patent-pending cones with Composite Foamed IMPP, which uses Interlaced Aramid Fiber sandwiched between Aramid Fiber (woven carbon-blended fiber) and glass fiber layers. This combination ensures greater rigidity and superior resistance against bending - ideal for reproducing midrange sound.The woofer for these PRS speakers is surrounded by high-density Micro Fiber. This material is not only extremely lightweight, but also features superior physical properties such as lower mechanical resistance and lower internal loss in comparison to other materials. This means that its linearity is truly excellent, allowing the voice coil's short winding length to be sued to its full potential. Plus, Micro Fiber is much less flexible than other materials, which stops unwanted "rolling" of the vibration system. This allows high power input for the speaker, with fantastic sound reproduction.Concept and style will pop up in your head when you see clear outboard crossovers for the PRS speakers.