They do get louder over time , old company I used to fly for were getting brand new A321's / 320's they were always quieter than the 15 year old aircraft . Ours are quite louder IMO

That being said the ear piece that united offers is pure garbage even with the custom ear mold out of Denver, And to everyone else on freq it sounds like we're flying with the windows open.

I use the telex 850 but that's simply cause they were nearly given to me for free . I would agree with most posters on here . Many don't use better headsets (for what reason I do not know) and even when they do have some they don't use the hot mic .

It's your hearing .

2 cents