There are many factors that work against quality car audio. The biggest culprit is road noise, competing with and canceling out critical audio frequencies. As this noise forces you to turn the volume up, you’ll quickly find that your in-dash radio’s small amplifier runs out of steam. The solution is to add an amplifier, dramatically infusing your speakers with plentiful, clean wattage. Writer Bio

How to Wire Amps to a Car Radio - 56