CentralNotice From Wikipedia, the free encyclopedia Jump to: navigation , search For other uses, see Hum (disambiguation) . The Hum is a phenomenon, or collection of phenomena, involving widespread reports of a persistent and invasive low-frequency humming, rumbling, or droning noise not audible to all people. Hums have been widely reported by national media in the UK and the United States. The Hum is sometimes prefixed with the name of a locality where the problem has been particularly publicized: e.g., the " Bristol Hum", the " Taos Hum" or the " Windsor Hum". It is unclear whether it is a single phenomenon; different causes have been attributed. In some cases, it may be a manifestation of tinnitus . 1 Description 2 History 3 Possible explanations 3.1 Mechanical devices 3.2 Tinnitus 3.2.1 Spontaneous otoacoustic emissions 3.3 Fish 4 Media coverage 5...