Just purchased an 07 Hummer H2. Totally disappointed with the Bose stereo. Sounds horrible. Added a kicker 1200W mono amp, and 2 diamond 12" SUBS. Now I have plenty of base but the mids and highs still sound bad. What can I do? I want to keep the stock head unit. HELP!!

 

My best suggestion would honestly be to just dump the whole factory system. I just hooked up my system and although it sounds good like you said mids and highs are terrible. Your gonna have to replace the head unit to get the quality sound that you want. From there tweeters, and new componets are gonna be needed. The bose factory stuff is just so terrible. If you have the money to get and 07 H2, you might as well do it right and just knock it all out and get some quality stuff. I know this was no expert advice, but hope I could help.