Strange Room Setup a Rubik's Cube?

I think my problem may be different from what most people encounter as one tries to confirm that the speakers are in the perfect spot.. I am trying to get my speakers set but having a problem as I read all the suggestions about standard formulas. You see the house was built in 1841. the floors are heart pine, with a wool rug and the ceilings are 11 ft plus. Let me get to it.. The gear is set up in the living room which is almost square 17 long and 19 wide..ouch. At the back of the room behind the listening position are two giant doors that open ( 7 ft wide x 10 ft tall) to the dining room the exact same size as the living room.. I keep these doors open, in effect, making the listening room larger, right?

So I am sitting almost in the middle of these 2 rooms. In trying to use the Cardas formula and others I am not sure what dimensions to use. I do not want to go broke on room treatment without having a good idea about speaker placement and listening position. Now the speakers are about 7 ft from the rear wall and 6 ft from the side wall in the living room.
My chair is on the equi-distance triangle between the speakers. I just plotted the graph for this setup and it was ok except for a big bump at 50 hz. The speakers are spiked and I have a few sound traps that don't seem very effective yet. Jennifer Warnes Way Down Deep is boom city.
So getting a little frustrated and looking for some ideas for a DIY fix since I cannot afford Rives.
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Get a decent equalizer and kill that 50Hz bump...

Try sliding your seat and/or speakers 6inches forward/back and re-measure to see how much the 50hz peak and other bass frequencies change. Make sure the mic is located where your ears would be(use a camera tripod). Small changes can make a surprisingly big difference. Remember that these measurements are indicative of what's going on, but still very simple. Trust your ears most of all. In most rooms, you will get some peaks and dips, but minimizing the bigger ones is a good start. Then it is all balancing act and tradeoffs.
Avoid an EQ if possible, it adds noise and detracts from the musical signal. Cheers,
No equalizer for me. I am currently researching a DIY bass trap. Looking at some mineral wood pipe insulation that is 2" thick. Thinking of stuffing a 10 or 12 inch diamater section about 6 ft tall with fiberglass insulation and placing one in each corner of the room. I think it will work just have to overcome the WAF of course.
Your room does not have to be difficult to setup. You should try setting up the speakers in a asymmetric relation to the sidewalls, but keep your listing potition equidistant from the speakers. Start with the speakers relatively close to the back walls and move them out until you feel the bass is natural and not over-emphasized. Placing furniture or absorbant wallhangings at the point of first tweeter reflection on the sidewalls is a good idea also. Contrary to common thinking and the Cardas "formula," an asymmetric setup can help reduce bothersome room reflections and resonances. Your rooms are large enough the you should have alot of flexibility with setup. Let us know how it turns out. All you have to lose is a sore back from moving equipment!

I removed a bar cabinent from the corner behind the speakers and that helped calm down the bass boom. That bar was being converted into a speaker ! ouch.