if i understand correctly, the noise is caused by physical vibrations (as opposed to electrical waves) propagating up the cables. i think it's basically insoluble for earbuds/iems.
Pretty close to how most people source. You can just leave out the ^ it's just an inline [1], [2] etc.
There are now hard and fast rules though, it's just common practice.
I think this is essentially people copying the ACM reference style.
