A car head unit is a device that creates a output from the music it plays, and most people thing that their car head unit is powerful because it says "50X4" on the front panel of it and thing they are running 50 watts, so their car speakers are getting powered nicely, wrong! Well you're not powering them with 50 watts that is real power, the rating on almost all car decks have peak wattage rating on the front of them, a wattage rating that is unrealistic and not the actual rms, this is to make them sell better. Most decent aftermarket from my personal car audio experience are around 20 watts rms per each four channels, which is enough power and to drive stock paper cone speakers, but not high powered component, coxial or 6x9 speakers that are aftermarket. But the horrid thing about driving car speakers from a car head unit is that it starts to create a clipping signal at around 75% of the volume, this is including distortion, which is not good if your aim is to gain sq.
If you have stock speakers in your car, then running them on your car head unit should be fine and sound decent at medium volume levels. But if you have replaced the factory paper cone speakers with aftermarket one's, you might need a car amplifier because they are likely to require at least 50 watts rms or more, as they need more power to perform at their best. A car amplifier is ideal because it can produce a clean, non clipping and distortion sound to your car speakers, which increase the amount of sound quality.
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