The article talks about how music can either be a social activity or a very intimate activity. Headphones have allowed this activity to grow over the years. The growth of ear buds and wireless headphones has increased sound and comfort for people and the technology continues to improve.Radio headphones were first introduced in 1919 and the pattern of improvement thru the years has been incredible.
Read the full article here:
The Evolution Of Headphones [INFOGRAPHIC] – hypebot
There may be apps that do that. You can definitely find spectrum analyzers that will measure ultra low.
Is there an APP that can measure the ultra low frequency levels?
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