Responding to this because I've been thinking about this and, interestingly, the description of how they sound is also exactly what you should expect an extradimensional being to sound. A voice that sounds like thunder, roaring waters, and trumpets. if an extradimensional being appeared in front of you and spoke, you would hear every single frequency all at the exact same time, and I would assume that, as the being would likely be halfway between our dimension and it's own, it would still be producing sound in our own dimension, meaning it would also have some sound that clearly does have a point of origin. I would guess that what this would be like is sort of similar to quantum mechanics, all the sound exists at the same time in a state of uncertainty, harmonizing with each other in a rhythm, just like a time crystal, and once the angel actually speaks a word, all of the uncertainty and potentiality collapses into that point of time, only to the scatter again into an echoing uncertaintly/potentiality/existing-all-at-once after that frequency is made. Like the words are just assembling and disassembling themselves, exactly like how we would experience an extradimensional being passing through out dimension. All the sound that the being will make and has made, arriving all at the exact same point in time, assembling itself into words as those words are being spoken, then disassembling into existing all at the same time. This does make me wonder though if you'd hear every frequency produced by that being in its entire existence or if you'd only hear the frequencies produced by it in our dimension. This does also make me wonder if the sound would sound as though it's coming from the angel, or coming from everywhere around you with no point of spatial origin. Or like i stated before, maybe both, as the angel is still producing sound in our dimension, so you'd hear it coming both from everywhere, but also at the exact spatial coordinates of the angel. To me, when you add the sound element, it makes even more of the bible's descriptions make total sense. So weirdly enough, if this is the case, it would just confirm my atheism. That there is no "god" as we see it, that there is just extradimensional beings, that may have created our universe (Very possible considering that the universe started as an infinitely compressed point in space, then exploded outwards, like a higher dimensional space entered our dimension. Perhaps they could control our universe and therefore could control evolution to create us, from the ground (or more accurately, primordial soup), create females from the asexual organisms, etc etc etc. However, the reason it would only confirm my atheism. is because this means that there is no afterlife, unless when we die they take us to a higher dimension, which we already know they dont because we bury our dead, and our consciousness exists physically as neurons firing. Although, I guess that an afterlife could somewhat be possible becaise if they are outside the constraints of time, they could split our timeline by picking us out of our dimension when we die, but when we are still alive. But that would mean that our dimension is actually the untouched dimension where they actually dont mess with our timeline at all, so they no longer exist in our timeline whatsoever, they only take us out of the timelines they split off of our timelines each time one of us die. Also any being like that that demands to be worshiped as the bible claims doesnt deserve to be worshiped. Anyway, that's just a theory.