The CS 6x9-Inch Triaxial (Three-Way) Speakers are as an excellent factory upgrade. A stamped steel framework supports a rigid polypropylene cone with EVC™ (Extended Voice Coil) technology, for the best sonic quality. Using zero protrusion PEI tweeters ensures you get every bit of clarity you need, without interfering with factory grilles. Adding a CX amplifier will give you even more power and clarity to your system. These CS speakers work best with 150 watts of recommended power.