Bose QC35 II owners complain of degraded noise cancellation after recent updates

I’m in the middle of reviewing the new Bose Noise Canceling Headphones 700, but before wrapping that up, I felt it was necessary to address an ongoing situation with the company’s previous set of headphones. Over the last few weeks, many owners of the Quiet Comfort 35II headphones have been insisting that a recent firmware update has noticeably worsened the level of noise cancellation. Outside noises are now easier to hear, whereas they were mostly hushed and inaudible before the update.

If you want more background, read this extremely long, comprehensive thread at Bose’s customer forums that discusses the issue in detail. “I created an account just to post that the 4.5.2 firmware update has totally destroyed the ANC on my pair of QC35…

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