also check the position of your sub in relationship to you satilite speakers,run another trace and see if that helps the low end in your room.also a good mic to use is the behringer ECM8000,check the phase on your subs then use ARC2 to clean up.
 
Good Luck.

BobbyT, not using a sub at the moment. I've heard mixed reviews on the behringer ECM8000. The knock on these mics are that they're not calibrated correctly.

I've looked into subs but my room is 11.5' x 16'. Not sure if would help or hinder with those dimensions, width wise anyway.
 

That really is pretty awesome for no bass traps .  Where you may have trouble mixing is in the 
100-300 area where there are peaks close to 10 db high. I really doubt you need subs.
  Just worry about your room from 40Hz to  500
   Arc could help you in your trouble area but I would try some more bass traps in you corners first.
but really I would have been very happy with that . 

Hi David, thanks for comments. You know , the more I research room measurements, acoustic treatment, etc, the more I get confused. It's really helpful to get advice from people who know about such things in this forum. I've researched bass traps and some sites claim foam in the corners will not be effective in absorbing lower frequencies. Others claim they do. It's an expense I would rather not gamble with. Which is why I thought the ARC 2 in addition to the acoustic treatment would be enough. I'm encouraged by the comments about my results. I'm not looking for perfect, just something close to acceptable.

 
Room EQ Wizard will do waterfall graphs, which would be nice to see.
 
I recommend you spend some time reading up on how to use it.  Maybe hang out a bit in the REQW home forum over at Home Theater Shack.
 
The Studio building / acoustics forum is also I good place to spend some time.
 
Acoustics is not a simple matter and will require a fair amount of study if you want to do it right.  Well, as right as possible in such a small room.  At least it's not square.
 
 

Here is the waterfall graph. It reads at the bottom from 0 to 200hz.  Looks cool, have no clue how to read it." />

The overall outline at the back is the (sort of instantaneous ?) frequency response of your room (* at the position of your measurment mic *) and the mountains coming towards the front are how the various frequencies decay with time. The flat part at the front shows that your decays keep going longer than the 300ms shown on the graph.  You should probably up the depth scale to be greater than 300 to get a better picture.  You'll then see which frequencies may be resonating/ringing in your room (which may be happening above 200hz shown).
There are a couple of nice dips in the frequency respone but there always will be and the most you can hope for is to reduce them as much as you can afford of energy, time and money.  Try moving your ear/mic position around and see how things change. 

Yes, up the time scale > 300 ms so the ridges decay into the floor.
Here is a perfect room waterfall. (Don't freak, no one ever gets even near this in reality).

Ideally, the entire face of the mountain should fall off evenly as it moves toward you (out of the page). This means that all freqs in the room decay evenly. 
The ridges and crevices on the mountain face are caused (mostly) by room modes. The modes are caused by standing wave peaks and nulls that I mentioned before and these are due to the dims between parallel walls and ceiling to floor. 
If you add corner traps, some of the ridges would begin to smooth out... wall to celing corner traps would smooth yet more... wall to floor corner traps even more.
The tricky part here if you overkill the low end traps and the lows decay faster than the mids/highs, the romm will be overly bright. If the highs/mids decay faster the room will be dull or dead.
In your graph some of the freqs take longer to decay than the max of the test. This is why it looks like it was sliced at the front.
If ridges extend really far forward, the room will boom at that freq. Crevices indicate that that freq will be deadened. 
Rerun the test with the time scale lengthened until all the ridges decay into the floor and repost.
 
 

The waterfall i posted was slice from a bigger graph. I can try to post the whole thing.