The mirror method will get the primary reflection, which is the more important of reflections to contend with. The area of the wall adjacent to the speaker will have reflections that will likely hit other points of the room well before it hits the listening spot, much due to the very wide reflection angle. In any case, you've targeted the first reflection that you needed to.
If you place the speaker closer than five feed to your listening spot, the ability for driver integration. I would keep a length of 6ft or more from the speaker to the listening spot, which is something you've already done. These aren't near field and don't pretend to be.
If you place the speaker closer than five feed to your listening spot, the ability for driver integration. I would keep a length of 6ft or more from the speaker to the listening spot, which is something you've already done. These aren't near field and don't pretend to be.