Near-field speaker placement

go there read that and download the calculator :

https://www.head-fi.org/threads/domo-audio-brings-you-that-sweet-spot-—-get-better-imaging-through-s...

One needs to experiment for one's self. Can you position speakers along either wall? I have found it best when speakers are placed forward of front wall and away from side walls. Listener should be forward of back wall. This obviously becomes difficult in a room of your size. You may want to try true near field positioning. My idea of near field positioning is when the distance between speakers is greater than the distance from listener to the front of speakers. In my case the between speaker (center line of drivers) distance is 61/2' and distance from speakers is 51/2'.

The presentation of the soundstage, fore and aft of front of speaker, differs greatly between speakers. This greatly impacts speaker placement.  

Room treatment panels behind speakers and listener and at primary reflexion points along side walls improves soundstage and imaging. Check out forums on acoustic treatment.

Buy Jim Smith's book Get Better Sound.
Read it.
Read it again.
Make notes.
Start moving speakers and listening seat.
Repeat as needed.
Be patient.
Do more moving.
Enjoy your now much-better-sounding system that only cost you the price of the book and your time.

Tom

I'm guessing 9' feet wide? My suggestion is 2' off the back wall and 1' from the outer wall, and dial in the toe in to your ears. Lastly, find the volume level that is best for your enjoyment.

Thanks for the responses and the advice, folks. I'll keep reading and keep adjusting. Onward through the fog ...