Comment by ultrarunner

The equalizer is easily 20 years old, and is restricted to presets. Presets! A parametric EQ is the only thing that can make Apple's own Powerbeats Pro sound good. And for several golden years (despite lots of Apple's work against it) we had a really good jailbreak equalizer that worked with Apple Music. Eventually I just gave up on the whole thing. But I remember going out for trail runs with good sounding music without worrying about losing my earbuds.