For best results, google the 'sub crawl method' and then utilize it because it really works well and costs nothing. If the subs have room correction built in, you can run it afterward if you'd like. However, the most important steps are getting each sub optimally positioned in the room and in relation to your listening seat.
@noble100 I have a love/hate relationship with the crawl method. I now am also very tired of the Sneakers soundtrack haha. The T7i definitely comes to life in the corners of the room. It was really cool to hear the difference positioning makes.
I imagine that with the four 12” woofers between my Spatial Audios combined with a second sub (for a total of 6 drivers), I should have plenty of low end to fill my 12 x 14 x 9’ room, despite it opening up into a much larger (twice as wide and 12’ ceilings) space to my left. I’m surprised at how the addition of just one sub was able to pressurize the room as is.