I’ve always been into audio technology of any kind, from high-end Hi-Fi separates to portable audio. Some years back I was introduced to noise isolating and noise cancelling headphones/earphones, since then I never looked back. It’s not until you cut out external noise from your listening that you will appreciate how much ambient noise there is, especially if you travel by and means of pubic transport.

This is a primer in the technology behind passive and active noise control, which will hopefully introduce you to the theory, benefits and caveats of these technologies.
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