Single vs. Dual Subs


It's common wisdom that dual or multiple subs help smooth out bass response in different spots in the room, but what about for a dedicated listening room with a fixed single listening position? What do two subs add to the music presentation that a single dialed in sub is missing provided that single sub is dialed in perfectly for the listening position?
Caveat: not interested in the SWARM method or multiple subs at the moment, strictly comparing single to dual subs
divertiti
  1. mc ~ " It is all summed at that frequency anyway. But, whatever.  "
  2. Kindly explain HOW, in your opinion, that happens???
“Two or more subwoofers also help in reducing low-frequency distortion and offer improved dynamics over a single subwoofer. This is a simple function of having more radiating area, plus more power on tap.”

 I suspect that we all understand that bigger drivers and more powerful amps are usually good for bass. ‘Twas ever thus.  But many of us have $, space and spouse constraints.
I’m considering getting sub(s).  My question is more like, “for the same money, are 2 10” subs likely better than 1 better (and more powerful)  sub?”   E.g., 2 REL t/9i vs 1 REL S/510 cost about the same. 
For that matter, is there a consensus (here? Lol) that REL is likely better for 2-ch than JL Audio or SVS?
All IMO:
  • the most bang for the buck are the Martin-Logan x series. Complete control set, available Perfect Bass Kit make integration a doddle.
  • JL Audio are very good, but pricier.
  • REL ain't what they used to be and are more jewelry than engineering. Their web malarkey is geared to the uninformed and WAF wimps.
  • Never heard or used SVS

My perspective is from fidelity and integration standpoints. If you want to be punched in the stomach [which does not happen when recording a kick drum] I'm outta my depth.

see  ieLogical SubterraneanHomesickBlues for more info and a primer on integrating small subs.

  1. mc ~ " It is all summed at that frequency anyway. But, whatever. "
  2. Kindly explain HOW, in your opinion, that happens???
Why am I required to explain HOW?

What if the HOW is automatic? What if it turns out the HOW cannot be anything BUT?

The wavelength at 80Hz is 4.3m or about 15 feet. At 20Hz it is over 17m or about 55ft. https://www.translatorscafe.com/unit-converter/en-US/calculator/sound-frequency-wavelength/ HOW are you going to ever manage to record that in "stereo" with any sort of ability to localize the sound without using microphones placed at least that far apart?? And in a room many multiples of those dimensions?

HOW are you going to do that?

Even if you do, HOW are you going to manage to play it back in stereo, in a room with dimensions smaller than the wavelengths involved?

HOW?