The right earpiece grunted after 2 months of use and made a drumming noise when touched. On March 18th, I planned on bringing it to the canonical repair outlet. The day the drums were finally silenced was also the day the noise reduction stopped doing its job. The cassettes were analyzed by the service center, which found no problems. Either the drum effect enhanced my hearing beyond what the noise canceler could handle, or my super headphones devolved into ordinary earplugs. I made my purchase from the legitimate outlet.
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