The best amplifier under 100 - buying guide and recommendationWhile an aftermarket amplifier is not required for a simple car stereo system, it is a terrific way to give your music new life. Installing an amplifier should be on your to-do list whether you want to pump some serious bass with a great sub-woofer, add more power to your existing car speakers, or simply increase the sound quality of your audio system. However, with hundreds of various car stereo amplifiers ranging in price, size, kind, brand, and quality, deciding on the right one can be difficult. That is why we have taken the effort to provide you with some recommendations for the best amplifier under $100.