Hello guys, I'm looking to build a car audio system for my next vehicle, and it would be awesome if you guys could give me any input on what speakers I should get. My budget is around 400 dollars, and I was thinking front and back door speakers 2 tweeters, 2 10"s or 1 12" sub, with an amp. Is it possible to hook up the door speakers into the amp to make it sound better? If so I would need an amp to power those as well. Thanks in advance.