I bought these to replace my Backbeat Fit 2100 headphones (which I always carried in a different bag). The Fit 350's sound quality isn't as good as the 2100. The 350s reduce more ambient noise, but I prefer the 2100's ability to hear my surroundings (especially since we often can't see their mouths in this brave new world moving where we are.) Unfortunately, I can't find THD or noise reduction specifications for either of the two listed here on the product pages. I hope Plantronics will share this information with us.
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