[Honkeytonk Monkey]

Why did you toss a bunch of 6x9s in the hatch panel? Or are those more junk factory speakers? The panel isn't secure so the speakers will just shake the crap out of it and they aren't even the same type of speakers so they will be playing the frequencies differently.

I'm frightened to ask, but what are you powering those speakers with? If you're running them and the factory speakers directly from the head unit, you are going to run into problems down the line.

This is going to sound mean, but I'm being honest. Throw that hatch cover out and buy a new one. Then read up in the audio Forums and start over. You seem to have kept the car pretty clean, so I don't know if this post is a joke, or if you just don't understand the concept of more speaker does not equal better sound yet. Also your wiring looks to be twisted wires covered in blue tape hanging down into a hatch with a bottle of nitrous? That's not safe at all.

Component speakers, or at least upgrades in the factory locations come first, then a subwoofer if you require more low frequency coverage, then you look at amplifiers to run yout front soundstage. I wouldn't even bother hooking up the rear door speakers in a car anymore unless I had a 4 door and took on passengers alot. Most SQ comp champion cars have only a set of components in the front, and thier amplifiers and subwoofers in the back, that's al you need for a stereo system (2 channels)

Like I said, and will likely be restated by some others, take it out and look into some other setups before you start again. Again, no offence intended just being honest.