@geleary123 ,
Square rooms are not ideal. You might consider a diagonal setup. If you search the archives, there are a few threads on that topic.
I used to own Thiel 3.6. They are very revealing & will do a great job but aren't too forgiving on anything upsteam. But you can't really consider that until you've optimized your setup in the room. The Thiels will really benefit from placement away from the wall behind.
Room treatment will help a ton. Opinions differ WIDELY, on best approach. Budget & effort is a consideration. Personally, a traditional approach...bass traps in corners and panels make the most impact and certainly impact relative to cost. IMHO, The Synergistic products are marginally effective unless you buy it all and spend a ton. Even then I'm not so sure they stand up comparatively. Plenty of claims that are over my head! Genius or snake oil...I've heard it called both.
Others take the digital signal processing approach vs. stuff in the room. Being an analog guy like me, that might not suit you philosophically. But your partner might prefer a box to stuff on the wall etc.
Tackle the room, one way or another, and if you're still not thrilled, then it's time to consider if one component or another might not be your best match w/ the others. But that's a whole different thread or two. Cheers,
Spencer