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Bose QC Ultra Headphones (2nd Gen) vs Bose QC Ultra Headphones (1st Gen): what's the difference?

Bose has a new flagship pair of noise-cancelling wireless headphones. The QuietComfort Ultra Headphones (2nd Gen) build on the five-star 1st Gen model in subtle but significant ways, much like the QC ...
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Bose QuietComfort Ultra Earbuds (2nd Gen) vs QC Ultra Earbuds (1st Gen): what's different?

A new pair of Bose noise-cancelling wireless earbuds is always big news, especially when they're the follow-up to the best noise-cancelling earbuds around, the five-star QuietComfort Ultra Earbuds ...