Sound Ledger¹ (WHO, Mics, MIDI)

Audio culture by the numbers

9: The number of seconds one can safely be exposed to 120 dB of sound, according to WHO (World Health Organization)

6: The number of noise-reduction microphones in the Anker Liberty Air 2 Pro earbuds, meaning just one more mic than there are words in the new product’s name

440 – 880: The range, in hertz, reportedly depicted in the new logo design for MIDI

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¹Footnotes: WHO: Microphones: MIDI:

Originally published in the January 25, 2021, edition of the This Week in Sound email newsletter (

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