My speculation is the physiology of those horn-like protrusions to be completely different from ours. While the other races' ears work similarly to us (meatspace humans), i.e. a cone of one shape or another, funnelling vibrations down to our eardrums, the Au Ra have horn-like protrusions. Vibrations created by the sounds would reach certain parts of the "horns" first before travelling to the other parts. I wouldn imagine the Au Ra can actually tell where and how far a sound is coming from with pinpoint accuracy. This would certainly open up the possibility of echolocation - just like what most of our real world bats do.
In comparison, most of the other races would have to rely almost solely on their binocular vision for spatial recognition just like we do meatspace.
As for audible frequency range (low bassy tones / high pitched tones) and tolerance to noises (dB), my guess is as good as anyone else's until they actually add more information.
In comparison, most of the other races would have to rely almost solely on their binocular vision for spatial recognition just like we do meatspace.
As for audible frequency range (low bassy tones / high pitched tones) and tolerance to noises (dB), my guess is as good as anyone else's until they actually add more information.
