I am looking into upgrading my car audio system. after doing a lot of research between boston acoustics, alpine, kenwood and pioneer i have decided to go with the Alpine spr-60c(front) and Alpine spr-60 (rear) for the Amp i will get the Alpine PDX F4. I am aware of how the amp and speakers rms ratio have to match in order to take full advantage of the product. However, i want to get the Kenwood excelon DNX 6990HD which produces 22 rms per speaker. will this make a difference since i will have a powerful amp to compliment the speakers???

 

the RMS of the head unit doesn't matter. the pre-amp volts are what concern you, if your going to use an amp. most head units are 2v-4v. the higher pre amp volts the cleaner and better you amp will run.