Bose recently unveiled the latest updates to its QuietComfort (or QC) line, including the QuietComfort headphones and the QuietComfort Ultra headphones and earbuds.  Bose’s QuietComfort line has gained a reputation over the years for its excellent noise cancelling, with the QuietComfort Earbuds II making several of our best lists, including the best headphones, best wireless headphones and best noise-cancelling headphones.  While Bose did launch a pair of QuietComfort Ultra earbuds, this guide will focus on comparing the two pairs
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