Ok, I'll try that. But now I still don't know wich of those 2 graphs I did correct. And is it normal that the sweeping sound during the measure routine is louder then the rumble during the check levels routine?
Also, I turned my receiver to CD mode for the checking levels because in DVD mode it didn't work. But I know that the bass levels in CD mode are a but softer then in DVD mode.

This is a new graph I took this morning. It was done with the normal levels that were set during the checking levels routine. But during the measuring sweep REW recorded clipping. That's weird because during the checking levels routine the level was just 12db as instructed by REW. I also don't if it's the black line or the blue line that's REW refference line.

Does this look ok? I still think it's very weird that there is't really a peak around 20 - 30Hz. I'm sure that the boom I sometimes hear is beneath 30Hz and especially in bass tones in filmscores. Maybe I did the sweep too low?