I am looking to have a system (in my 87 s-10 ext. cab) that will be able to play some good rock tunes and also be unobtrusive (ie. I don't want kick panels or large woffer boxes). I already have a Pioneer 35Wx4 head unit These rear speakers and these fronts All in the stock locations. I will also sometime upgrade to MP3 head unit with some more power to handle the full range speakers. What the system now lacks is some bass (who would have thought with such big speakers /forums/images/graemlins/wink.gif ) I have been thinking of puting something like some Image Dynamics CX64's in the doors and a small amp under the seat. Do you think that is a good plan? If not what would make it better and why? Would some small free-air subs work better in the door? If so what would sugest? What exactally is the difference between a small free-air sub and a mid-bass speaker?