Ground Zero Radioactive separate systems are Klippel-optimized for best possible performance. Woofers have light and rigid aluminium cones and rubber surrounds. Their parameters are optimized to door installation. This means that you get very good bass response from door locations with these drivers. Tweeters have neat housings with soft touch finish. These you can use to install tweeters on the dash, a-pillars or mirror triangles. Very easy to install and aim to desired point for perfect staging. Crossovers are split in two different housings per side instead of regular one. This makes it a lot easier to install midbass to door and tweeter to a-pillar or dash. You no longer have to run new cables from the crossover to both midbass and tweeter, since both have their own crossover units.