What you are trying to do will not yield what you want. As said before, you need to set up a calibrated mic at the listening position and take a snap shot.
Even then you should start by trying to adjust the room acoustics to remove any nasty artifacts. This is a manual process of adding sound absorbant material or removing sound absorbent material to get a closer to neutral room that is neither too live nor dead. You also want to look for nodes and antinodes and try to squash them so that the listening environment is as consistent as you can make it. Speaker placement is another venue to experiment with. Once you have the room set to the best possible condition you can adjust using an EQ.
I would recommend further reading about room acoustics and why simply using an EQ does not work well. There is much more than that.
While we would all like to have perfect rooms and even treat them sometimes it isn't practical. In fact many times it isn't. Unless you have a dedicated listening room or home theater you can treat the whole room. So what can you do.
Hide stuff. I find the area behind a cabinet a good place to add some cabinet backing that helps some. Even a little helps. Also behind pictures in a frame. Nice Curtains. Even a rug can help some.
But i understand the limitations of aesthetics in a shared space.
hometheater shack has a very nice program to help with EQing and it interfaces with many EQs. Also they have test tones there for every frequency. I suggest you take as many measurements around your primary listening area as you can. Then average the number and based on that average apply corrections to the large areas not the quick spikes. EQ is great when done well. It sucks when done wrong. If you decide to give up Auddsey comes on many receivers and does a decent job.
