Not pumping however many extra decibels into your ear due to the extra blocking is pretty valuable Absolutely true, but comparing the DAP volume setting doesn'

Not pumping however many extra decibels into your ear due to the extra blocking is pretty valuable Absolutely true, but comparing the DAP volume setting doesn't tell you that. The Bose QC-x are relatively insensitive, so the DAP volume will be on a higher setting regardless of the amount of noise blocked/canceled.