As a student technician I would spend several days each month helping experienced engineers to minimise the noise in and around an audio mixing console system prior to it`s final test. Despite the fact that fully tested modules worked satisfactorily on the bench, they behaved quite differently when connected together in a console frame. The main interference problems fell into the category of hum or buzz. This was dealt with by a process called "finding the hum loops". In recent years I have discovered this was all unnecessary. The introduction of the EMC directive with its professional audio EMC standards EN 55103- 1/2, has helped us to solve these problems and abandon our decades-old poor engineering practices.
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