Designed for smooth, balanced output above 60 Hz and capable of handling the power of today"s high-powered head units and amplifiers, the TR525-CXi delivers impressive sonic output and quality.A smooth-sounding, 1/2-inch textile dome tweeter with ferrofluid cooling delivers smooth, accurate high-frequency response. The injection-molded, mica-filled, polypropylene woofer has been painstakingly engineered for gradual and smooth upper-frequency rolloff, resulting in a seamless transition to the tweeter"s frequency range.