Ambient Noise Reduction
Interference from external sound can be reduced either by active noise cancellation, or by attenuating noise getting into the ear. The two headphone types that do this attenuation best are in-ear canal headphones and closed-back headphones (both circumaural and supra aural). Open-back and earbud headphones provide some noise isolation as well, but to a much lesser extent than the closed-back and in-ear. Typically closed-back headphones block 8 to 12 dB and in-ears anywhere from 10 to 15 dB.
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