You sure it's not Delta Turbines ?
Mine screams it's little white butt off but all I do is sit on the settee and turn the TV higher to drown out the noise.
These graphs do look to be rather suspect though. I knew the xbox would be loud - but hey when it's under the TV and you've got it all in 5.1 with the sound of bullets raining down around you it's not really something your going to notice.