You can aim the tweeter to improve high-frequency dispersion in many vehicles.
Focal applies the same technology they use in their home audiophile-grade systems to their Integration line of car speakers. Their Integration ISC 690 6"x9" speakers feature cones made from Polyglass, a material that combines the warm sound of cellulose with the strength of glass, so they play accurately with no added resonances.
The Integration processed-aluminum inverted dome tweeter features a built-in phase plug and wave guide, which act together to improve the dispersion of the high frequencies for a more effective stereo soundstage. You can also tilt the tweeter for better imaging in many vehicles.
Integration speakers allow you to put Focal sound quality and construction into your vehicle without a lot of muss and fuss, so you can enjoy a dramatic jump in performance over your old speakers. Grilles are included.