[ Troubleshooting ] Buzzing or Hissing

In some cars, the BTC455 may produce a buzzing or hissing sound. This sound is caused by ground-loop issues with the car itself, which can occur when the stereo system and the rest of the car’s electrical system are not grounded to the same level. The noise can be removed by connecting a ground-loop isolator between the BTC455 and the car’s Aux port.