First of all, I'm on a budget. I plan on sound deadening the doors of my Mazda Protege5 and, having no experience whatsoever, I've been doing a lot of research on sound deadening. I've been searching through various forums, and I've even visited a few local shops to get their take on doing doors, and it seems that there are two approaches to applying deadener on doors.
The first approach is more "minimal." This approach is to apply strips of deadener in various places in the door, just enough to prevent resonance. Deadener is also applied where the speaker is mounted, and maybe a deflex pad right behind, and the job is done.
The second approach is much more comprehensive. this involves applying deadener to nearly every surface in the door, and applying sheets of deadener on the outer door skin to seal any holes.
My question is this: If I were to sound deaden just the four doors and nothing else in my car, would it be worth taking the comprehensive approach, or would it be good enough to take the "minimal" approach. I know that since I'm only doing the doors, I'll still be hearing some road noise and such, and that's ok for now. I also know that there'll still be a difference made with any bit of sound deadening, and I'm wondering if the difference between the two approaches in the door is significant. Thanks for any feedback given.