"Not distracting" is kinda subjective. The office I work(ed) in happily, is too noisy and distracting for some of my colleagues.
Technical data sheets are worth a read. You get them from the horses mouth, not from the web shops.
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Model Acoustical Isolation ---------- ---------------- DT 770 Pro ca 18 dBA DT 770 M ca 35 dBA
Interesting... I just looked up some Peltor ear muff specs (listed at the website of 3M if you dig deep enough) and they vary in the same range as the earphones we compared: from just 18 dB up to over 30. So it really depends on which model you have.Since the Peltor earmuffs were enough to give me "near silence" [...]
As said, I own the DT 770 "M", and if nothing comes in through the wire, you hear the environment muffled. If environmental sound was at 80 dB SPL, it would now be 45 dB SPL. Only sounds below 35 dB SPL (background sound in a library will be total silence) go down to 0 dB hence are silent. It's a big difference with the "Pro" which attennuate by 18 dB (rustling leaves will be silent again)
To get an idea of how loud any dB SPL number is, read up here: https://www.iacacoustics.com/blog-full/ ... evels.html
You'd have to compare cans side by side. Personal preferences and expectations also play a big role.