i have the kappa 693.5i's in the rear of my 5th gen with 100 watts RMS going to each of those coming from an Alpine 4ch amp. Needless to say, they sound AWESOME. zero distortion no matter how high you crank them. I also have Alpine 5.25in Type-R components in the front with no amp, the kappas take the highs completely away from the front. I just dont have the money for the amp right now. Regardless the kappas sound Great.