極低頻噪音讓人發病！

http://ibe.sagepub.com/content/5/1/44.abstract

Low-frequency noise, centred around a frequency of about 7 Hz, was found to occur in several office rooms investigated. Symptoms resulting from exposure to infrasound can include fatigue, headache, nausea, concentration difficul ties, disorientation, seasickness, digestive disorders, cough, vision problems and dizziness, that is, symptoms typical of the sick building syndrome.

我坐在陽台總是覺得比較舒服，不知與此有關否...

在音響應用嘛，這幾年發現，人耳對低頻噪音（120Hz以下）似乎相當敏感哪...聽者或許不自覺，但一經比較立刻能察覺差異。