JBL GT7 Series speakers are the optimal choice for those audio junkies who desire an upgrade to their factory sound and style. Because they fit most factory sizes and come with mounting hardware, installation is hassle free. Featuring Plus OneTM woofer cones and a frequency response up to 21kHz, the individually voiced GT7 series speakers are designed to blow you away in both sound and style. Harmans patented (US patent #7,548,631) Plus One„ polypropylene cones provide more overall speaker-cone area than other cones in its class ” the result is higher sensitivity, increased low-frequency output and greater musical character. The GT7 component systems feature external crossover housings, which provide extra space for true high pass and low pass sections “ a step up from the coaxial models “smoothing out the critical midband response where most of the music occurs. Theres also a tweeter level control, which allows fine adjustment to suit varying listening tastes and to accommodate different placement. Frequency Response Up to 21kHz: Hear what youve been missing ” the JBL GT7 Series offers a frequency response that delivers the full-range response associated with exceptional sound.