The most common and effective way to add an AUX input to your car is by identifying your stereo system and choosing one of three main methods: using an FM transmitter, installing a cassette adapter (if your car has a tape deck), or hardwiring a new AUX input directly into the stereo. The best choice depends entirely on your car's existing equipment, your budget, and your comfort with DIY installation. Hardwiring provides the best sound quality but requires the most technical skill.
Understanding Your Options
First, look at your car's stereo. If it has a cassette player, a cassette adapter is the cheapest and easiest solution, though tape mechanisms can wear out over time. For cars with only a radio, an FM transmitter plugs into your device and broadcasts a signal to a vacant FM frequency on your stereo. This is wireless and universal, but sound quality can suffer from signal interference.
For a permanent, high-quality solution, hardwiring is best. This often involves using a device like a GROM Audio adapter or similar interface that connects to the CD changer port on the back of your factory stereo. This method preserves sound quality and integrates seamlessly, but requires you to partially remove the stereo for installation.
Installation Complexity and Cost Comparison
| Method | Estimated Cost | Sound Quality | DIY Difficulty | Best For |
|---|
| FM Transmitter | $15 - $40 | Fair to Good | Very Easy | Low budget, minimal technical skill |
| Cassette Adapter | $10 - $20 | Good | Extremely Easy | Cars with a functioning cassette player |
| Hardwired Adapter | $50 - $150 | Excellent | Moderate to Difficult | Users wanting OEM-like quality and permanence |
If you're not comfortable removing your car's dashboard, the FM transmitter or cassette adapter are your go-to options. For the hardwiring method, search online for a specific adapter kit for your car's year, make, and model. Websites like Crutchfield.com are excellent resources for verifying compatibility and purchasing the correct parts. The installation process typically involves using plastic trim tools to carefully pry off the faceplate around your stereo, unbolting the stereo unit, plugging in the adapter harness, and running the AUX cable to a convenient location.
