"Localization" is the Term fellas... This term refers to the listener's ability to detect where the Subwoofer is. We want none of that.
LF Percussive Instruments do not emanate Pure Tones. Rather, they have Transient Content of much higher frequency that is quite easily located by the Ear. (I'm trying to recall the Allison Krauss Album that contains some of the JUICIEST TOMS!) The "Stereo Bass" issue gives me pause. Ex: The Wavelengths involved with an E1 on a Bass Guitar (28 feet) are simply too great for our Our ears to localize. Mains on the other hand DO convey the Snap, and Pluck that DO help us know WHERE the Upright Bass is...hopefully not our Subs.
That said...
TWO (2) Subs is my solution to Mono-Sub Summation networks, Boxes of Resistors, etc. Unless we ALWAYS sit with our Ears in one place, one Sub is a no-go for me. Any Sub worth consideration already has such "summing" built-in to allow Single Sub Users to function...at least until they can buy the Second Sub.
Why are Two Subs better?
Thanks to Overlapping in-room Modal Behaviors, Two (2) Subs broadens the "best" listening area substantially, yielding a better, overall "even-ness" of the Bass Response in the Room. Go ahead! Argue, and Nit-Pick all you want, but I do believe the Data is on MY Side regarding this!
@VFTS...Give it some consideration! Unless you're listening in a Broom Closet, 2 Subs widens the listening area, increases Headroom, etc.
*Unlimited Thanks to my Dear Friend Ed Mullen at SVS who has over many years, shared with me his Boundless knowledge of Audio.
Do it!
Curt
Vintage 2018 ADI-2 DAC. "Classic AKM4490 Edition"
Cables: Red, and White Ones.
Speakers: Yes