frequency response should not be a deciding factor when buying speakers... for the simple reason, that when the manufacturers test the frequency range of the speakers, there is no "standard" for testing it... you dont know how much power they are using... what kind of signal and what environment they are testing in. Every manufacturer varies... so when you look at frequency response, you can only really compare speakers of the same brand.

To tell you the truth about your selection, the Infinitys are gonna be your best bet... great power handling, very crisp and clear highs and good midbass... Infinity makes good speakers... much better compared to Kenwood and Pioneer.