dunno what to say about the pressure as there is no way that some plastic pc speakers have enough low bass to pressurize the air to do that. as far as the beaming thats just shitty directivity and id say that for the first time ever you lowered your head enough that the speakers were on axis with your ears causing them to not sound like shit in the high frequencies. hope this helps if you want to know more look up speaker directivity and radiation.