Dead spot in my room with my bass

[BLindsay]

argh this is driving me up the wall, it seems no matter where i put the sub there is always a dead spot where i sit, it wouldnt be because where i sit is pretty much dead center in the room is it? Its so annoying because i go upstairs and listen to my deads cheapo infinity sub and he seems to have bass everywhere in the room. And i know the klipsch is def. outputting because every damn thing around me rattles lol. I have tried moving it all along my front soundstage with no luck