Distributed Bass Array configuration

@mijostyn Both the experts cited have extensive experience in audio, i.e., it’s their profession. Neither are subwoofer salesmen. In both cases, their answers were detailed, and in both cases, they explained pretty carefully -- in Poes’ case, with great detail. In both cases, neither proffered sweeping generalizations about stereo bass, Indeed, the case was pretty well established that in many cases, mono bass was better for room acoustics and might be the only thing hearable, anyway. The information they provided is not susceptible to ad hominem remarks. To be clear, they are not offering arguments that are "pro stereo bass" or "pro mono bass."  They rebut the claim that there is NO such thing as stereo bass and it can NEVER matter. There is, and it can, with all the qualifications provided. I thought that the OP's question was seeking to learn about this topic, so I provided what seemed like good information, rather than just my experience, which is meager.

I run one pair crossed over at 150hz (in front) and one crossed over at 80hz, so I do run stereo, but I doubt it changes a huge amount in the end. I've played with the phase but don't notice any effect. Like @heelid I placed my Swarm at different heights, two lower, one ear level, and one close to ceiling. I experimented with different orientations, and firing toward the wall produced by far the smoothest results. These were very easy to integrate beautifully in my system.

@mike_in_nc place a phone call to Duke Lejuene at AudioKinesis who manufactures the Swarm which he'll tell you was based on a theory by Earl Geddes. If you search the web I think there is also a white paper out there by Earl that explains the concept and placement ideas. Duke provided a placement guide based on the Golden Ratio that I dug up somewhere. It is a good start but with some experimentation you can dial it in. He has gained a wealth of information on this topic and is more than willing to share.

I did my own swarm using 10" woofers in sealed boxes. Crossed over at 70 or 100 Hz depending on the mains speakers using an Accuphase F-25 frequency divider. Two woofers firing towards the walls, two woofers firing into the room, one of the four woofers raised to ear level. I put the woofer nearest the corner out of phase by swapping the leads.

Since you have line source ribbons @mijostyn has an interesting set up for that type of arrangement I used with my Acoustat Model 2 speakers. His theory in effect creates a line source for the bass. You can chat with him as well to get more information.

I don't agree with much of anything written on this thread, except for if you like it then you got it correct. On the other hand, bass sub frequencies are felt more than they are heard and you feel directionality in your sinuses, medical science. Proper phasing of the bass frequencies makes a huge difference to the quality of the performance and the power requirements to achieve a great performance. When the bass image is in the same plane as the rest of the image it is magical. Typically this is a achieved with a speaker management system. There are manufacturers who specialize in such equipment. You could say it is all in the science and the knowing.