Even now after years of clarification still we have members sharing misinformation. Please do a search and read through all the excellent factual information provided by myself, Tim, Duke and of course the research papers by Geddes, et al. These all make perfectly clear the fact sub bass is not directional, there is no "ambience", it is not stereo, and the one sure way to better bass is not to have a bigger more powerful sub but to have it coming from more locations.
If you rely on comments at least filter them to eliminate the ones who don't know, because they never actually did this stuff. For example, I know subs are mono from having run multiple subs every way imaginable. Stereo, mono, L channel, R channel, one, four, five, in phase out of phase all kinds of phase, on and on. Every time you see someone talking about stereo bass, timing, anything like that, do not take it at face value. Dig deep to see where that is coming from. Almost always it is repeating what someone else said, without ever once trying to see if it is true or not.
Do your own due diligence, please.