Inline Volume Control for 3.5MM Headphones,Black

I recommend also adding this to the flying set: https://www.amazon.com/Stellar-Labs-35-4180-Headphone-Contro...

In most airlines the announcements are at fixed volume, independent of the movies. That means you can put the video on full volume and turn it down inline. No more announcements screaming in your ear :) (and better sound quality as a bonus)

I had exactly this problem when listening to music on my phone using cheap, low-impedance earbuds! I searched for audio player apps that offer some equalizer controls. One option is to lower all the sliders equally across the different frequencies, but it's easier to get an app that also has a single "preamp" slider which affects the signal across all frequencies. I settled on Poweramp [0], which has a two week free trial. I bought the full version (4 USD) after confirming that it did what I wanted.

I agree with the other answers about getting an in-line volume control -- if you're using wired headphones. They're also great on airplanes: turn the provided entertainment up to maximum volume with the buttons on the armrest or wherever; turn the volume on the in-line attenuator down to nearly zero; listen in comfort. I noticed that whenever an announcement is made in the cabin, it seems to disregard your volume setting on the entertainment and just blasts your ears at 100%. If you've already set your in-line attenuator to deal with movies at 100%, then the announcement doesn't hurt your eardrums. I bought this one because it doesn't add a lot of extra length to the cable [1].

[0] https://play.google.com/store/apps/details?id=com.maxmpz.aud...

[1] https://www.amazon.com/dp/B008DJTB32