Power ground, also known as protective earth (PE) or safety ground, is a fundamental feature in almost all audio electronics. It provides a path to safely discharge excess electrical current and prevent electric shock in the event of a fault. On the other hand, signal ground is often disregarded or underestimated by audiophiles and less experienced dealerships.
Analog music signals oscillate around a zero reference point as they travel from positive to negative, resembling a sine wave in basic physics or trigonometry classes. The challenge arises in how the zero point is established and maintained across different manufacturers and types of audio equipment.
