iamasmith
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Yup, sounds something like a "patulous Eustachian tube", which means that the tube is abnormally open. usually this is in the context of damage to the tube (such as by radiation), but I have heard of people being able to consciously open their tubes completely, leading to symptoms like this. Hearing your own voice loudly in this situation is called autophony, and some people hear the noise of airflow through their upper airway when the tube is wide open...
Mike
Sounds spot on, I had forgotten that my voice or humming also sounded like a booming noise to me whilst I did it (you forget these quirks sometimes when you have had such a thing all your life).
As a side note, I had terrible ear pain diving down to the bottom of the (2m) pool as a kid and never thought I would ever be able to Scuba dive (thinking it was my weird ears causing it) and it was only when I was visiting a doctor for some tests many years later that they did an air pressure test on my ears and I discussed my strange ability and they said it was fine to dive.... man all those years wasted :S.
Thanks,
-Andy