It is not just a matter of getting the right speakers, but getting the right speakers for your particular car. If they don't fit right, they won't sound right. Getting car audio speakers that are too big for the available space is a great way to guarantee lousy sound. Putting them in an area where they will be muffled by your feet, by luggage, or by the car upholstery is another way. Take into account the car design and get speakers that are suitable for it. After all, the car stereo system should work as a whole. Every aspect of the car design should be in tune.