Since the beginning of AC power, audio equipment has often had hum problems. Hi Fi gear needs to amplify signal in the tenth of a volt range, always working in the close proximity of large audio signals in the 110 to 230 volt range. These large audio signals are the AC power lines operating at 50 or 60 Hz, an audio tone corresponding to a low hum.
Minimize Ground Loops If More than One Piece of Audio Equipment Has a Grounded Plug
If just one component of the audio system has a ground connection and there is no antenna connection, ground loops cannot occur. If there are hum problems then follow the guidelines in this article on how to fix audio hum problems to trace the cause. However, if more than one component is grounded, then there is the possibility of a ground loop. This article describes how to identify if audio equipment is grounded.
The simplest solution to multiple ground connections is to use a single mains distribution panel and to plug the grounded components into the distribution panel next to each other. Hum and buzz problems due to ground loops start to make their presence known when audio components are plugged into separate ground connections which carry leakage currents and noise from other mains-powered gear.
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