Hi Mike, I started reading your thread a week ago and thought you may resort to a hand grenade to really sort out the problem
I was going to suggest you use a pair of headphones as a reference, which effectively removes the room's acoustic signature and will allow you to hear the rest of your components. Perhaps something for you to consider if you get 'stuck' again.
Your AN speakers are an unusual approach which has some merit. By utilising the room corners no Baffle Step Compensation is required in the XO design. BSC always robs a few dB's from the speakers sensitivity. 3 dB saved is the same as upgrading to an amp of twice the power.
The corner placement also, via boundary reinforcement, enhances bass and permits more perceived bass from flea power amps. It also removes some but not all of the problems associated with strong early refections. It is a brave approach, which any designer worth his salt will understand. The vast bulk of speakers are tending towards easy to market narrow baffle designs, not everybody has corners available nor are they drawn to relatively plain 'unattractive' boxes.
To be clear I am saying you have a good pair of speakers which are worth persevering with.
The graph posted by Martin, which he described as 'the alps' was incorrectly interpreted. That is not the speakers' frequency response, which if it was I agree is hopeless, it is the individual response of each drive unit and it is the summed response that will represent the freq. response.
Marco linked to a review on your speakers. I think he should stick to listening impressions and not try explain the technical side of the design. Below is a copy/paste of where I stopped reading!
"What else, you ask? The spacing between woofer and tweeter is too large to create a cohesive top-to-bottom sound, and mating an 8-inch woofer to a 1-inch tweeter means that the midrange can’t work properly. After all, most of the rest of the industry is of the view that an 8-inch woofer can’t negotiate the upper midrange while also producing ample enough bottom-end"
The photos of your room indicate some acoustic treatment is necessary. You are renting but any treatment installed can be relocated to your next place if you move. Acoustics play a bigger part than most realise. A square room will need more work than a more friendly oblong room with better length/width ratio.