Using 2 Subwoofers

Sidssp,

I am aware of all the tech reasons you're referring to. In my room I can't place the sub in the middle because there's a large aquarium smack in between the speakers (has been for the last 35 years in a number of homes). With a single sub on the left or right I didn't necessarily hear the sub but with stereo subs I DO hear a broader and deeper soundstage particularly with classical music. I "know" the rules but I "experience" the effect of stereo subs-it sounds wonderful.

My room is very similar in size to yours, and I find my single Velodyne F1500R is more than enough bass. Location is on one side, in the center it did not produce much bass. My main speakers are ADS 1590/2's, full range in their own right. But still the sub is needed. I can't imagine sticking 2 subs in a room my size!

Multiple subs, placed asymmetrically should even out some nodes....bumps and dips.
Equalization will help for a small area at the expense of larger peaks or dips elsewhere. For a single listener, a single equalized sub should work. In my room, where I have the TV, I got lucky and have a wacky, 8 sided room with an off-center vaulted ceiling. I've looked (listened, actually) for bass bloom and suckout without much luck. I also crossover below 40hz and run my panels full range.....That, too, may help.

One of the advantages of using 2 subs is you can get away with smaller drivers.
A room that sounds good with a big 12, or 15" sounds even better with 2-10" subs.
You pick up alittle speed, and your room does not have to compensate for such nodes (trying to support 30hz clean).
A stereo 50hz, sounds alot cleaner than a mono 30.
I once had 2 Klipsch 8" powered subs hooked up, and they sounded better than all the premium single (12&15") subs I have owned, especially on 2ch music.
Just my opinion, I am no expert by anymeans.