Distributed Bass Array configuration

Of course not. Especially not since I agree, at least in my disdain for experts, and credentialism in general.

What gets me is what I said- asking very specifically for the advice of people with a DBA. But then when you get it you go with the advice of someone who not only has no DBA, but knows nothing about them, and in fact runs around threads like this where his lack of knowledge is expressly not requested, and spreads his bad advice as if he actually knows what he's talking about. 

I had a friend, an expert fisherman. This guy knows everything about everything when it comes to fishing. When another friend was looking for advice on a boat I naturally referred him to my fisherman guy. Who said sorry Chuck, I am not gonna help him. Why, Larry? Nobody knows more about this than you. "Because I don't want to waste my time" and then proceeded to tell me all about people he advised who then ignored everything he said. So he doesn't do that any more.

Me, I am more selective. No hard feelings. No more help either. I'm sure you understand.

Its not just me by the way. Read the thread. You disrespect Tim as well. So basically the only two guys to give you what you ask for you disregard and disrespect. 

I hope a sub with a continuous phase control will work well enough.

Nope.

"All-Pass phase controls operate at only a single frequency with varying degrees of shift across the passband."

see http://www.ielogical.com/assets/SubTerrBlues/PhaseControl.png at  ieLogical SubterraneanHomesickBlues for an image of how a continuous phase control functions.

Mike_in_nc, if you get an acoustic measurement mic and program like this one, https://www.parts-express.com/Dayton-Audio-OmniMic-V2-Acoustic-Measurement-System-390-792
You can measure group delays and frequency response. You should be able to adjust your subs perfectly.  I assume with their location you are using a low crossover point. What are you using for your main speakers?
Where you place them depends on your main speakers. Subs always perform best in corners. They are up to 9 dB more efficient which means much less distortion. For point source main speakers four subs in four corners would be ideal but two in corners and two right up against side walls would be a close second. A sub should never be in the middle of the room. That is like running your outboard motor out of water. For maximum dynamics you have to be able to adjust delays so the sound from your subs gets to the listening position at exactly the same time and in phase with the sound from your main speakers. This requires digital bass management. Are you still using a digital crossover? What happened to the 2.2X? Yes, Apogees have a reputation they do not deserve. They were capable of amazing sound on occasion but their fragility disqualifies them. Magnepans are a much better design from a reliability standpoint and if a ribbon tweeter blows (which they do rather frequently) Magnepan has a great tweeter replacement program and if you can use a screw driver you can change the tweeter. Apogee went belly up for a reason. 

Don't know if you are familiar with  Earl Geddes?

You should check him out and read the several white papers regarding subs and other stuff

http://www.gedlee.com/Papers/papers.aspx

@danager -- Thanks for the link to the Geddes papers. I surely know the name, but I don’t think I’ve read anything of his.

@mijostyn -- I use Janszen Valentina P8 main speakers. In my basement room, they respond well to 20 Hz, but a room-induced hole at 40Hz necessitates subs. As you say, subs project more authority at LF, even though SPL may be the same. The two Fathom F112 subs are in the rear corners, next to floor-to-ceiling bass traps. That is the spot in which the 40Hz hole can be filled most reliably. I use digital crossovers at 80 Hz, mostly, done by an Anthem STR Preamp, far better sounding than the Classé CP-800 it replaced.

I used to adjust sub delays with an OmniMic2, but that broke. (Lesson learned: do not position measurement mics by grasping the wand and moving it.) In a stroke of fortune, I won a UMIC-2, so I am learning REW, which appears quite capable, if complex.

I sent the TacT 2.2X to a mod shop in southern California to have the SRC replaced with a more modern one and some other components swapped. Unfortunately, the proprietor never finished the work and never returned the unit (which five years ago, was in pieces in a storage locker somewhere). The Anthem is one of the newest generation of audio DSP devices, and unlike the TacT, and very unlike the Classé, I don’t hear any artifacts when engaging the DSP.