I've read a few post on what people have been doin with their speakers in their sonata's. I just wanted to see what most people's opinons and any helpful info people can give? I was thinking of putting some 6.5 coax in the rears then maybe thinking of doing some 6.5 comps up front. If i do this should i get another amp to power them if so it has to be a 4 channel right?...how would it sound if i just replaced the exisiting speakers with the new ones w/o an amp? i did that in my xterra and it didnt' sound too bad. Any suggestions?