rear door speakers louder than front?

I'm inexperienced and I want to learn:

In my 2003 Tahoe (non-Bose) I currently have: Pioneer 50w x 4 h/u, Punch 50w rms coaxial 6 1/2 's in the front doors, factory speakers in the back doors, and 2 12" punch subs behind the back seat. The front door speakers are run from the h/u front rca output to a Punch 4020 amp. The factory tweeters in the front doors are still connected and playing, as well. The back door (factory) speakers are run from the h/u rear speaker leads with an rca adapter to the Punch 4020. The Punch 4020 is bridged to 2 channels: one for left and right front door speakers, the other for left and right rear door speakers. (This was not my configuration of choice, but a way to make the speakers play with the limited amount of speaker wire I had at that time. I am aware that this does not produce the proper Ohm load for the Punch 4020, and I intend to correct this.) The 2 subs are run from the h/u sub rca output to a crossover and a Phoenix Gold 200zx.

So, why are the rear door speakers much louder than the front door speakers? I have examined and adjusted the amplifier gains to improve balance, but am not yet satisfied. Also, I have heard that the front door factory speaker components my have factory crossovers, and that I should not use these factory crossovers with my Punch 6 1/2 coaxials. Additionally, should I not use the factory tweeters with the Punch coaxials? One more thing I've heard: the rear door speakers may have a factory installed external amp somewhere, (maybe under the driver's seat?). Any truth to this?

I want to improve the sound (in quality and volume) of my front door speakers. I am considering an upgrade to component sets, but first I would like to be sure that I'm correctly using (or not using) the equipment that I already have. These particular Punch 6 1/2 coaxials have sounded much better in previous vehicles. And I'd like to have a plan of action before I remove the door panels again.

As a housewife and mother of two infants, my budget is limited --I'm paid only in diapers and kisses. I relish each moment that I can steal away after bedtime and become engulfed in my favorite music. Music is a part of me; I want the music to surround me, so that I am a part of it.

Please give advice or suggestions...

I believe that the speakers are in phase. The speaker wire (for the front door speakers) is run from the 4020 amp's two front channels to the head unit and tied to the OEM front speaker output leads behind the head unit, (+) to (+) and (-) to (-). The signal then travels through the OEM speaker wires to the 6 1/2 coaxials, which are connected with wire connectors, not the OEM speaker connectors. The (+) terminal of each speaker is connected to the OEM wire that was labeled "B" on the OEM speaker connectors, because such was the polarity of the OEM speakers when I tested them with a battery.

Of course, I may have incorrectly labeled a wire during installation...   What other problems should I look for when I tear into this project again?

This is probably your best option to get the sound and balance you desire. Use the punch amp only for the coaxial speakers in the front doors. Use the deck power for the rear speakers and this should give you better control and balance.