Originally posted by Wezil 
I suspect an internal cause.
Something along these lines (from wiki):
			
		
	I suspect an internal cause.
Something along these lines (from wiki):
The tensor tympani muscle making the eardrum tremble
As of 2005, a scientific hypothesis suggests the Hum originates on the eardrums of affected individuals by the tensor tympani muscle trembling. (The tensor tympani is a muscle within the inner ear for tightening the eardrum.) The 40-page hypothesis can be read in German on the pages of the German Association for Research about the Hum, IGZAB (InteressenGemeinschaft Zur Aufklärung des Brummtonphänomens). See: http://www.IGZAB.de . See de:Brummton-Phänomen.
As of 2005, a scientific hypothesis suggests the Hum originates on the eardrums of affected individuals by the tensor tympani muscle trembling. (The tensor tympani is a muscle within the inner ear for tightening the eardrum.) The 40-page hypothesis can be read in German on the pages of the German Association for Research about the Hum, IGZAB (InteressenGemeinschaft Zur Aufklärung des Brummtonphänomens). See: http://www.IGZAB.de . See de:Brummton-Phänomen.
 I can't read German.
  I can't read German.
							
						
 So, without shouting, please review reading comprehension. The hum is place related, it has nothing to do with my ears.
 So, without shouting, please review reading comprehension. The hum is place related, it has nothing to do with my ears.
							
						
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