Mains hum, electric hum, or power line hum is an audible oscillation of alternating current at the frequency of the mains electricity, which is usually 50 Hz or 60 Hz, depending on the local power line frequency. The sound often has heavy harmonic content.
Read more about Mains Hum: Causes of Electric Hum, Prevention, Tone, In Music, In Audio Systems, In Forensics
Famous quotes containing the word hum:
“My book should smell of pines and resound with the hum of insects.”
—Ralph Waldo Emerson (1803–1882)