PowerPlant is the most technologically advanced car audio we've ever made. You've never heard anything quite like this�..With speaker cones forged from CURV, a material only found in exclusive audiophile hi-fi products, we've produced a speaker range with industry-leading accuracy and efficient sound reproduction. With hi-tech butyl rubber surrounds and magnets formed from a high-grade magnetic material, superior sound is always guaranteed. PowerPlant Full Range Speakers also have an external crossover for more precise sound, adjustable by 12dB.