Etymotic er4p with a custom null audio cable and ACS custom eartips, this is not noise cancelling, it's total blockage, when you have music playing someone can

Etymotic er4p with a custom null audio cable and ACS custom eartips, this is not noise cancelling, it's total blockage, when you have music playing someone can stand in front of you shouting at full volume and you won't hear anything but your tunes Although ACS no longer make custom eartips there are other places that do such as snugz, without doubt custom tips are the single best upgrade you can buy for your sound