Determine your car audio requirements
You can get a modern car audio system for well under $100, which will still be an upgrade if you have an older system with a limited range of features. However, even the most basic systems made in the last decade still provide a degree of flexibility. For example, if your in-car entertainment unit provides a USB port, you’ll likely be able to connect a pen drive or a smartphone, allowing you to listen to music from that device. Some systems also allow you to easily hook up a satellite radio.