The bass is the place...

I use dual subs placed opposite each other midway between front and rear walls. Works for me. Never tried DBA unless you count front towers with built-in so
subs plus the duals. Have to admit, it did sound sweet. 

Iy is true you need multiple bass transducers like a powered sub to get bass right across a room.

However most speakers only can get the the rest right in a single sweet spot so a single sub can serve well for that as well.

To get it all right across a large area one needs very wide dispersion or Omni speakers to start with else the solution is not complete.

When I listened to the Focal line I always said, WHERE'S THE BASS.

Swarm/DBA Duno! might be.

I use my monitor sections in a traditional way.  350 hz up planars

I use 2 Midbass units that are really the strong point of my system, WCF
12" X 2 per cabinet tuned with a 12" Passive radiator, Their tuned at 40-350hz.

I removed a lot of distortion by using and changing phase plug lengths, and profiles. Big speakers cones normally produce a lot of pressure, sound better. problem is, all that surface is a great place to collect bass at the wrong time.  38" the top of the drivers, 8 ft ceiling
In a stereo way, become very directional with phase plugs.

4  true sub units, usually only 2 at a time.  2 10", 2 12" all tuned with PR
12" tuned 20 to 40 hz,  10" are 30-60 hz , located 2ft X 3ft from the walls
None of the active drivers face each other only the passive. 3.5 cf boxed
140 lb loaded boxes.  70% decoupled from the room

8 active drivers, and 6 passive drivers, all through an Active Crossover 2494 NO DSP correction. Only crossover points. Able but not used.
350 hz down, only a passive XO  in the monitor sections, NEVER use the bass sections in the monitors.

So total of 6 units, at different heights, but a pair set up as stereo, 
kinda swarmish, sure sounds good, all class d, (now). There are no tube amps from 350 hz down, only up, and that varies in the summer months.
Love class d amps, and tubes though, just crazy good.

I also have huge french doors, with heavy curtains, swung open bass goes away, doesn't bounce back into the room

A note: I been using servo units, I just can't get use to it. different story.
All most finished on some 8" LS MB Narrow, baffle SATs. Phase plugs too.

Regards

well, why is the bass the place manufacturer cuts down?
for real bass, you need woofer, big ones (think minimum dual 10 inch or 12 inch woofer). A big woofer need a big box, which drive the price of the cabinet manufacturer up; shipping price is dramatically increase as the weight and size of the box increase. so really, in order to build a "real" speaker that actually can do bass at loud spl, you need to sell that speaker much more pricey then say a 2-way using a 7 inch woofer in a 20L cab vs a 12 inch woofer in a 100L cab.

and that is without even mentioning the fact that for it to sound integrated, a 12 or 15 inch woofer generally needs to be integrated in a 3 way system or used with a horn to make that system to work in most cases (Ill keep the bbc ls5/8 out of the conversation)

so yeah, real bass drive the price of building a speaker up,up, up.

imo, 2-ways with sub cannot compete with a speaker using 12 inch woofers.