I had an issue with my studio that indicated less volume on one side than the other. As it turned out I already knew that my hearing in my right ear needs more db for some reason than my left ear does. According to my audiologist I have good freq. in both ears but my right ear seems to need more volume. If I hadn't known I would have likely blamed ARC2 for the difference. Maybe not an issue for you but I thought I'd throw that out there. 
 
 
In most studios the speakers are more or less in a triangle formation with the listener as one part of the triangle. Are your speakers set up this way? Stupid question number 2 (I'm sorry I had to ask. It's usually the stupid things that sink me)- Is there a chance that you panned your bass? Do your studio monitors have any controls on the back that might influence their performance?3. Is  Is there a chance that the correction procedure might need reevaluating? If the mic picked up something else during corrections it could change the outcome.3. Have you tried exchanging monitors to see if the problem might lie there?...I know you probably covered all of this but I had to ask.
 
I would be curious to see what would happen if you added a sub woofer to the setup. If ARC is correcting more bass in one speaker because you have a really strange shaped room then adding a sub woofer could help in taking the bass to another location in the room. I would also be curious to see what maybe moving the speakers slightly ( if possible) would do.
 
 
I'm not really sure what's going on here but hopefully a few changes will correct the correction.
 
 
 
 

Starise
 
In most studios the speakers are more or less in a triangle formation with the listener as one part of the triangle. Are your speakers set up this way? Stupid question number 2 (I'm sorry I had to ask. It's usually the stupid things that sink me)- Is there a chance that you panned your bass? Do your studio monitors have any controls on the back that might influence their performance?3. Is  Is there a chance that the correction procedure might need reevaluating? If the mic picked up something else during corrections it could change the outcome.3. Have you tried exchanging monitors to see if the problem might lie there?...I know you probably covered all of this but I had to ask.
 
I would be curious to see what would happen if you added a sub woofer to the setup. If ARC is correcting more bass in one speaker because you have a really strange shaped room then adding a sub woofer could help in taking the bass to another location in the room. I would also be curious to see what maybe moving the speakers slightly ( if possible) would do.
 

I did check all the obvious things like ensuring the switches on the monitor backs were all in the correct (and identical) positions.  Also, the pan position is absolutely central, no additional EQ in place, etc.  We're not talking about a massive bass correction here.  Maybe 3 or 4 db on one side more than the other.  It's enough to hear but not over the top.
 
I don't want to beat this to death.  The ARC 2 correction is beneficial, IMO, and I don't perceive any problem whatsoever sound-wise.  If there were a problem then more testing would be warranted, but since it ain't broke (sound-wise), there's nothing in need of fixing.  The UI images are puzzling - that's all.  I suspect a possible bug in the display logic and wondered if anyone else had the same suspicion.
 
Thanks all for your ideas. 

Bajan Blue
My room was very very bad, and was off centered as well (one monitor near a corner, the other one more in the center of the room)
I experienced a very similar profile to this, but to be honest I think my room was so bad using ARC seemed only to make it worse.
So I stopped using it.
What I decided to do and am just doing now, was to rebuild my room / studio and build a purpose designed control / mixing room and a separate live / tracking area. Hopefully with all the treatment being done to the control room, it will be as near as perfect as I can make it (have spent a lot of time on ratios / sizes  / damping etc and some money), so I'm hoping I won't have a need for ARC.............. 

If you take enough time to rebuild properly, there will be no need for ARC. Did it that way, never used ARC since ...
Anybody wants the license; it's sitting there idle ... I could swap it for ST3 - oh wait that's not the thread for ST3 bashing, is it?? ;-)

Hi David,
 How about doing something crazy like running one of the speaker sources through an extra, post ARC output, analog stage where you can mangle the frequency response on purpose to see if it displays the "mangle" in the right place in your ARC gui? For example; run one output from your DAW through an outboard mixer and take out all the bass, or highs, or etc. You get the idea. :-)
 
 The reason I would be curious to try this is that I suspect that the ARC display is correct and confirming so would provide a lot of food for thought regarding the difference in what you think you hear and what ARC's test mic thinks it hears.
 
 Of course, if doing so doesn't confirm that the ARC display is correct than you have some other useful information.
 
 all the best,
mike 
 

mike_mccue
 
How about doing something crazy like running one of the speaker sources through an extra, post ARC output, analog stage where you can mangle the frequency response on purpose to see if it displays the "mangle" in the right place in your ARC gui? For example; run one output from your DAW through an outboard mixer and take out all the bass, or highs, or etc. You get the idea. :-)
 

Clever idea, Mike.  If I had an outboard mixer or something equivalent, I'd be tempted to try just that.  It would certainly provide an indisputable proof of a bug, if one exists.

As Basil Rathbone said in The Lady in Green: “Oh, Watson, what a fool, what a fool I’ve been!”
 
A friend who’s been following this thread e-mailed me a possible explanation that is highly credible.  Audessey technology utilizes both EQ adjustments and phase changes to modify speaker output.  The ARC UI shows the level correction graphs, but those graphs (I think it’s safe to assume) do not depict any phase alteration information.
 
My room has no bass traps, so, yeah, there’s going to be some issues in the lower range of the audio spectrum.  A phase change in the 50-200Hz range made in a speaker’s output could easily cause a significant change in perceived volume near the listening position even if no level adjustments whatever were being made.  Seems totally obvious in retrospect, and now I feel a little bit stupid having not thought of it right off the bat.

That's kinda what I have been suggesting all along.
 
;-)
 
all the best,
mike