I just purchased my 2008 Mazda 6 IVE. I am kind of dissappointed with the radio's sound quality. It is not the BOSE one but I was thinking that if I replaced the speakers (and only the speakers) it might help with the sound. I don't want to go too crazy and want to keep the Headunit. I know the Headunit makes the radio.... But I was wondering if anyone has just replaced the speakers, and what kind did you buy? Was there significant improvement?

I don't want to change the car much, but I could use some richer sounds while listening to the radio/cd's.