Midrange Stereo Receiver Midrange 6 3/4 In Speakers?

Midrange 6 3/4 in speakers? - midrange stereo receiver

I am very satisfied with my current stereo system satisfied, but have not yet replaced the factory rear speakers. This is a 6 3 / 4 inch speaker, and I am looking for something that they are a kind of mid-range. I feel that my current setup has tons of bass in the back and tons of corners at the front, but behind the ears (where the factory rear speakers are in a Camaro) I hear nothing.

I'm basically a 6 3 / 4 inch speaker that does not focus solely on peaks. Comments?