I think one of my rear speakers is not working, because it makes a vibrating noise while other does not do that.

So where i can replacement? Approximate price to replace it? how hard it is to replace?

Also i am looking to replace my head unit with something different, so it will have ability to hold 6 cd inside and ability to play mpr too. Another ability is to interact with my bose speakers. Please give me name of unit which will be easy to install in place of bose and do those stuff I need. Must be double din, dvd with screen would be awesome No need for tape unit.

Thanks in advance for your advices and help.