3E20.50 - Noise Cancellation
- John Koser, "Laboratory Investigation of Noise-Canceling Headphones Utilizing "Mr. Blockhead"", TPT, Vol. 51, #6, Sept. 2013, p. 332.
- Claire Maldarelli, "To Go Silent, Sometimes You Need To Make Some Noise", Popular Science, Winter 2019, p. 100.
- Jim Allen, "Headphones That Turn Down the Volume on Excess Noise", Popular Mechanics, Sept. / Oct. 2020, p. 70.
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