gm factory radio bass loss

I also have a Kenwood head unit (40x4) and 6 disc changer which I removed from my old car that I coudl put in. Only problem is, I'll lose the MP3 capability, XM, and RDS (the main reason I tried to hold onto the factory unit) Perhaps a powered crossover? Would that help at all?

I also heard that with some gm models you have to keep the factory head unit connected even if you install a new one?? How can I be sure whether or not my car ('05) Chevy Cobalt) is one of those?

I would sell the Kenwood units and purchase a new unit with MP3 capability and satellite ready input. Some units have RDS also, I believe Alpine units do and they will also do XM. Even if it is out of your price range I would save up, it will be well worth it.

Now as far as your other question about the radio having to stay in the car, yes it is partially true and this is a data vehicle with GM's new data system, LAN, but most of these new vehicles GM's producing nowaday's are getting smarter and not putting anything past the radio on the data bus (anything past the data bus after the radio no longer works) like they did prior. The only thing you will lose should be just your door chime and delayed accessory (R.A.P.).  Kinda sucks for some people but getting a better radio is well worth it, IMO. 

Now they do make harness' to retain the data functions and keep your R.A.P. and chimes, but not for the new LAN systems. So until that becomes available you will have to use a standard harness which Metra makes one, 70-2103. Your kit part number and antenna adapter from Metra in case you wanted to know is  99-3302 and 40-GM10. Hope this gives you some insight.

Ok, I know this is a little out there and such... But, well... You can't afford a like $300 HU or more for a good one... But you can afford a brand new car? Given the Coblat has like a starting price of 17k I think, but still, I can't really afford 17k and I don't have any bills really other than car audio. *thinks* This just doesn't add up...