Just curious if there are any other audiophiles on here - in this case ones focused more on earphones (IEMs), as opposed to headphones or speakers?
Wonder if anyone’s experienced any differences using different IEMs?
From the hobby, I’d guess that some earphones are going to present sound/information in the approx 20kHz range more accurately and immersively than others.
And in the last couple of years, quite a few earphones have started using bone conduction drivers, which add another dimension to reproduction of music or sounds by sending imperceptible vibrations into the inner ear, making the sound more realistic, nuanced or whatever.
Quite a lot of the bone conduction drivers focus on the part of the audio spectrum that covers the upper registers of hearing and beyond, so again, it got me wondering about how it might play with ultrasonic Subs 
To be clear, none of this is a big deal at all; I just happen to have the audiophile hobby, which has transformed my listening and enjoyment of music, and so I’m just idly curious if there might be any crossover with regards to listening to Subs