sub will not affect the speakers but the sub will probably not sound best in the center of the wall. typically they sound best near corners. follow your sub's instruction manual for best positioning.
Subwoofer between speakers?
After reading through a thread relating to the equipment rack between speakers, I assume that the sub between the speakers is also a no-no?
My speaker stands are 24.5" high, and my sub is 24" high, so I was thinking that the sub cabinet being below the mid-range driver might mitigate the detrimental effects to imaging. But I read a reply in the thread that I alluded to which talked about an amp between the speakers having a negative effect on imaging . . . therefore it stands to reason that a big bulky sub cabinet would be about 20 times worse.
I know that ideally I should experiment with placement . . . this is an extreme near-field listening room, and options are limited. I could get it to the outside of my right channel speaker . . . in theory, would that be better than in between?