I have been a traveling audiophile for decades. Over that time I have tried all the evolving technology, head amps, DACs, in-ear, over ear etc. I own an Astell & Kern SP2000 with add on amp and Focal Utopia. Also UltraSonde Edition 8… which are easily driven by an iPhone.
I travelled extensively and typically would find most of the time listening in airports, planes and noisy venues along the way. In all of these places the “audiophile” part of the experience is completely compromised by the noise. The noise floor is so high that the high end is nearly completely gone and the midrange is highly compromised.
Then on a whim while in Tokyo one weekend I picked up a pair of Bose Quiet Comfort headphones. They completely changed my life. They are made for noisy environments. The noise cancellation and the tonal balance is made to sound very pleasing and fun in noisy conditions. They are comfortable and wireless. I put them on when I enter the airport and take them off when I arrive at my destination. Often just leaving on the noise cancellation and not listening to anything. it simplified my travel sooo much and made the experience so much better.
Not lugging a case with all my wires and batteries or the A&K brick is wonderful.
Have a look at my headphone system under my userID. Now that is where to listen to headphones… where the noise floor is 30db.