This stereo RCA isolation transformer isolates the audio signal in order to considerably reduce interference and therefore noise. This allows a large transmission distance to be achieved without distortion. To do this, the circuit integrates a unique impedance conversion and spectrum isolation system with anti-EMI capabilities. In short, this product solves the problems of distortion and noise that can be caused by a long connection or a difference in electrical potential. A 4KV protection system (ESD) is also integrated, allowing to protect the devices connected to the insulator.