If you want to be able to jam out to your tunes and make calls over your car’s speakers without completely replacing the head unit on your older car, your options for adding modern connectivity are limited to two options: FM transmitters, or a bluetooth car kit. We get a lot of questions from people asking about …

Simply put, an FM transmitter sends your music signal over the airwaves, while an FM modulator injects your music signal directly into your car radio. They both work by sending FM frequencies similar to radio broadcasts, which is then picked up by your car stereo antenna. FM Transmitters transmit the frequencies wirelessly and FM Modulators …

The BMW compatibility says that it supports “Non DSP only”. How do I know if my car has DSP or not? If you have a 3 series relax, it was never an option. But nearly all other BM’s even the options have options DSP stands for Digital Signal Processing and is used to enhance sound quality. …