Background Perhaps the toughest environment for any set of headphones is peak-hour train public transport! For this usage, my priorities were: ambient noise isolation, portability and ruggedness. In-ear headphones were not an option, so it was a decision between on-ear and over-ear headphones. Despite being tempted by several over-ear models (especially the DJ models, due to hopefully better noise isolation), I ended up buying the Beyerdynamic Custom Street on-ear headphones, due to the smaller size being more portable. This was quite a leap of...