I understand the basic process of ANC in headphones and earphones. But when an pair of earphones says “42 dbs” of noise cancelling, does it mean sounds louder than that, say 50 dbs, will sound as loud as 50 dbs or 50 minus 42 dbs?
In: 10
It means, in this case, that all sound in the operational range is reduced by the 42dB. Which for most ANC headphones is limited to sounds below a fairly low frequency – they work best on low frequency repetitive noise like airplane engines, less so for human vocal range, and least of all for higher frequencies than that.
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