Not so great for blocking speech. https://productivity.stackexchange.com/questions/7213/do-noise-cancelling-headphones-block-human-speech-and-pa-systems https:

Not so great for blocking speech. https://productivity.stackexchange.com/questions/7213/do-noise-cancelling-headphones-block-human-speech-and-pa-systems https://productivity.stackexchange.com/questions/7213/do-noi...