I am trying to figure out what stereo I am going to install. Not necessarily the brand but the general set up. There is so much info out there; the more I read, the more confused I am. I am leaning toward 6x9 speakers (one speaker in each front door, 4 speakers in the back), subwoofer, and one amp for speakers and one for sub. Is this overkill? Would I need a separate accessory battery to provide enough power? I really don't want to do that. I just want really good sound, not booming and not super loud. I would like to find out what others have done (without needing an additional battery). Any insight or suggestions?