4x SoundXtreme 6x9 520 Watt 4-Way Red Car Audio Stereo Coaxial Speakers- ST-694

It includes mid-bass, tweeter to produce a very good sound quality. If you're a real audiophile, it might be worth swapping out your car's speakers for ones of a higher caliber. And the good news is that you don't have to spend a fortune to do it, either.

eBay