There are a few things to consider when purchasing a car amplifier. The first is the price. A good car amplifier can be had for a fraction of the cost of a high-end amplifier. Additionally, it is important to consider the type of amplifier. Some car amplifiers are designed for use with certain types of music, while others are more general-purpose. Finally, it is important to consider the size of the amplifier. A small amplifier can be used in a small car, while a larger amplifier can be used in a larger car.