6 cheap cars with killer sound systems

2012 Nissan Sentra SL

Price: $20,360

Audio Upgrade: $1,690

Total Price: $22,050

The standard six-speaker stereo on the Sentra SL comes with lots of goodies.

You get a CD player, auxiliary input jack, USB port with iPod interface, XM satellite radio, audio controls mounted on the steering wheel and speed-sensitive volume control.

Adding the optional 340-watt Rockford Fosgate stereo guarantees awesome sound flowing from eight speakers, including two subwoofers and four tweeters.

Although the premium sound system only costs an extra $550, Nissan will only let you indulge if you buy some other high-end extras.

Figure that you'll have to spring for a moon roof and navigation system at $990, as well as splash guards for $150, before you'll be allowed to beef up the audio.

Splash guards, really?