Hi there, I recently purchased a '92 Geo Tracker and when I got it only one of the speakers worked and the factory head unit was crap. So I have a new head unit to put in but wanted to put a little work into the system, nothing fancy. I've done some research and found I need 4-4" speakers, but I wanted to bring in an amp and 2-6x9"s to bring in some mid level bass without a sub. So my question is I guess, where do I start looking? I want to make sure everything will work together, but I am so lost with ohms and crossovers and whatnot, I don't know which end is up anymore. If someone can clarify what I will need to look for when purchasing the components for this setup. Thanks in advance. Oh and I was also looking at putting in a Blaupunkt THb 200A slim powered sub in for some added bass. It's only an 8" and has a built in amp, nothing special or too big. If someone could help me sort all this out and put it into action I would really appreciate it. Thanks.