So my question is pretty straight forward: can 98kHz audio files be played on iOS devices? If someone has a link on tech specs I would really appreciate it.
Do you really mean 98Hz? I'm assuming you mean 96 kHz. If so, then no, not without resampling down to a supported playback rate. If you actually mean 98 Hz (and your music collection is assorted sub-bass classics), then yes, if you resample up to a supported rate.