Tried a variety of my music today during my walk to try to identify issues with bass. Mamas and Papas sounded a bit thin, except for several bass-y tracks which sounded fine. 1960s (remastered) mix in 16 bit. Then tried Steely Dan's Aja, new Japanese pressing on fancy disc, 16 bit. Superb bass. Superb everything! Kettle drum sound in both channels is right there. Try this album and you should hear plenty of low end. It's clean, it's well-placed, it's not murky. It's full without overpowering everything else. After that I put on a 24 bit The Beach Boys Pet Sounds. Again, sounds great. If you are curious, try playing, from that album, the instrumental "Let's Go Away For Awhile" or "Caroline No." If you can't hear bass on those, either your iems are broken or you've blown out your ears.
Mids and highs are superb. These are delicate-sounding, without being brittle or anemic. Really good iems. though I think what you play and how it was mixed will determine how much bass you are hearing. I'm also getting a bit of microphonics when I walk, more than with the Dunu 1000s. Using a clip, wires below ears. For $125, these things sound much more expensive.