2 ms·I have worn mx4s for 4 years in my home office for over 10 each day with noise cancelling. No issues.by rajamaka 4y agoI have worn mx4s for 4 years in my home office for over 10 each day with noise cancelling. No issues.bl4ckneon 4y agoSimular situation. For the mx4's they sound so much better when ANC is turned on rather than off imo. Especially the bass/lower frequencies.grogenaut 4y agoI agree with that, they sound great... The tinnitus doesnt.