Room Treatment Question, lost the lowest bass notes.

Thanks for the reply's. 
I am not adding any subs. I got enough money spent on equipment, $45K.
I could spend money on having the Wilson Tech come set speaker placement. 
I have my seating position at 16 ft away from the front now. I could move it back a few more feet if needed.
I did shift the center of my speaker center to the right about 3 ft. That helped. I have a brain fart with the initial speaker placement.

I also added (2) 2 x 4ft sound absorption panels on the back wall and (2) 2 x 2 ft panels behind the speakers.  

Time to let my ears do the judging.  At this level of HiFi.... It is all in the room now. 

I had great luck using Vicoustic Extreme Bass corner stacks. These won't overdamp, just sound better the more you add. See my systems page.

@bill_peloquin, The 'Wilson' setup is demonstrated (somewhat) in a video by Wilson.
https://www.youtube.com/watch?v=UOI8py0DAC8&t=358s
The process described begins with finding a 'neutral zone' and this can be best demonstrated with an assistant vocalizing a sentence / tone (an octave or  two). First against the wall and then moving into the room five inches at a time (or less). Until voicing (literally) sounds normal (like outdoors).
One note: Vocals is only one third of the audio spectrum.
Highs and lows also need to be addressed separately.
Also finding the correct distance between L/R (mains) is significant.
I would suggest that the distance should be one that gives the best perceived power for a given volume (same).
Set up the Mains first without the Center Channel.
Integrating the Center Channel afterword should be easy especially if you are able to adjust in the time domain.
Also notice that there is no 'room treatment' shown in the video!
The Wilson line would be a baffle less type design (generally) with a more uniform radiation pattern.
Once a zone (for placement) is located fine adjustments (inches / cm) can be made. Toe in as well (a further discussion).

  bill_peloquin:
" Thanks for the replies.
I am not adding any subs. I got enough money spent on equipment, $45K.
I could spend money on having the Wilson Tech come set speaker placement.
I have my seating position at 16 ft away from the front now. I could move it back a few more feet if needed.
I did shift the center of my speaker center to the right about 3 ft. That helped. I have a brain fart with the initial speaker placement."

Hello Bill,

     I think you need to reread my first posted reply on your thread. Apparently, you don't believe that bass sound waves behave very differently than midrange and treble sound waves do in any given room.  Or, you don't believe that all floorstanding speakers have the same inherent problem that they can be positioned in the room, and in relation to the listening position, to either optimize the midrange, treble and stereo imaging performance or they can be positioned to optimize the bass performance, but it's virtually impossible to optimize both at the listening position.  
    Unfortunately, the physics and acoustics related principles causing this issue remain true regardless of the price or quality level of the pair of floorstanding speakers utilized. The most expensive and highest quality floorstanders share this exact same problem with the least expensive and lowest quality floorstanders. The basic reason for this shared problem is that the bass drivers (woofers) are not independently able to be positioned in the room, and in relation to the listening position, to optimize the bass performance.  They're permanently affixed in place within the cabinet.
     But you've stated "you don't want to add subs because you've already spent $45K on your pair of floorstanders". You also stated, however, that " I could spend money on having the Wilson Tech come set speaker placement." Are you actually implying that Wilson professional techs know more about the physics and room acoustics of obtaining very good in-room bass performance than I do? Really?
     Well okay, I have to admit that's a very good assumption and definitely true. If this is the case, however, then they'd also know that everything I stated in my first post is true and they'd realize that there is no speaker placement that will optimize the midrange, treble, stereo imaging AND bass performance at your designated listening position.
      Perhaps this is the reason the Wilson Audio loudspeaker lineup also includes very expensive independently positioned subs? I suspect they'll recommend at least a pair of their budget bargain beauties for your room.  Of course, another option would be just buying this complete 4-sub DBA kit:

https://www.theabsolutesound.com/articles/audiokinesis-swarm-subwoofer-system/

Best wishes,
   Tim