I have QC35 II headphones and love it, but it has too much bass. The equalizer would have been so helpful.
I tried one app which has an equalizer that actually tests your hearing (and headphone frequency respones along with it), and it makes all the difference!
With it my $300 headphones sound as clear and precise as a $1000 ones. But it would be so much better to have it built in the Bose Connect App, so it would affect all audio.
Compared to all my hi-fi speakers and hi-end headphones, QC 35II have much more bass and the overall impression is of a bit muddy sound.
I heard that similar Sony headphones have even more bass and I'm so glad I didn't buy them 🙂
The app is Urbandenoiser. Their "Natural Sound" is an owesome feature, but the app is a player, so you can't listen Apple Music or podcasts through it. Only the tracks that you've downloaded.