Amplifiers
Everyone knows you need an amplifier in your car's audio system if you want thumping, window rattling, trunk vibrating bass, but adding an amplifier will provide so much more than you expect. With a high quality amplifier you'll get much better overall sound quality. And if you've upgraded your speakers or added a new subwoofer, a separate amplifier will provide the power needed to get the most out of them. It will provide the power that the amplifier inside a dash mounted receiver just can't deliver.