Subwoofer recommendation and wisdom

@tcutter  Now my eyes know what my ears are experiencing!  That's cool.

@stuartbmw3 Definitely two subs minimum because of the dimensions of your room--not its size per se but because it's square.  Single subs in a square room are problematic as i learned consulting with Jim Smith on my old music room which was square.  He said the peaks would massively stack in the same place and same frequency and the nulls stack in the same place, creating boomy bass where it stacked and nothing where it didn't--but he and Todd Welti both say two subs in opposing corners or midwalls will eliminate this effect in square rooms and create smooth bass throughout the room, although you will probably still have to do some crawling.  There are a lot of complicated reasons for this but understanding your room modes, their frequencies and where they are will go a long way to understanding why you need at least two. I put your dimensions into Amroc's room mode app and it said 29.7 Hz and its harmonics is where they would massively stack.

["@bartsw    The crawl is outdated and likely not something Dirac and Audyssey would recommend. One crawl does not tell you whether you are far or near target like a mic and it takes many crawls. It's just a yes/no at best. It does not tell you the frequency response, peaks and everything between. It also does not allow for multi-sub integration. You would be done sooner and get more optimal results pushing the subs using sliders and measuring. Also you won't damage your back and the couch dropping a few hundred pounds on it. Two 260lbs B&W speakers, two 60lbs B&W DB4S sub, one 180lbs SVS PB16 sub.']

Dated, absolutely. I'm certain it was used before it was shown to me in 1967 without the crawling around and the moniker of course. Through all the years of HiFi subwoofer periodical dismissiveness this hack assumed this simple method was common knowledge in this community. Not even close even today.

I've owned two pair of Studio and in home auditioned S8 Paradigm speakers. At a show not long ago I was allowed to run a short test recording from my iphone through an Anthem / Audyssey / Paradigm system with a sub in each front wall corner. Clearly this manufacturer's presentation goals remain foreign to me. 

Without any Dirac knowledge I'm guessing the resulting crawl standing bass wave room locations are close to the Dirac conclusions? If so, the crawl may be considered for an approximate -3dB sub to room free integration positioning? Can Dirac digitally control the subwoofer system leaving the full bandwidth to the main system in the analog domain, and for about how much?     

In 1967 the Octavium came with a dolly. I've dollied and further decoupled all my subwoofers over the years. Currently using dense latex and closed cell boogie board foam under the cabinets and extra soft rubber casters.