The whole point of ANR (and there are 2 or 3 versions of it) is that you do not have anything IN your ear. You have a speaker comfy against your ear, an outised mic to register ambient noise, and with the better systems a 2nd inside mic to control things. A leak path makes no difference. I can not wear earplugs on a holiday, 6 hours/day for 5/6 days. It hurts. Bose QC20 is heaven.