Looking for non-boomy full range speakers

I had fantastic results with the Hybrid Apogee Centaur Major in a 11 by 12 room. It was fairly easy to drive with the right mix of tight bass and beautiful highs that planners are known for. An absolute steal at 1200 to 1500 on the used market.

Highly recommend Merlins if they fall in your budget,good luck,Bob

For all practical setup choices in that small room, you'll be stuck with boom in the 60,50,40 hz and bellow range mostly. You will otherwise have the speakers way out towards the middle of the room and in unreasonable spots to get flatter sound with a full range speaker. Also, that room won't support much lower than high 30hz anyway, from first glance. I think you'd better off with maybe a sealed speaker or more bass limited choice.
Basically, your only hope is to "EQ" the bass woofer on larger speakers, This becomes much more involved.
I'd go larger Book shelves and be done with it. The room/setup is going to limit the qualility of bass you get otherwise, not so much the speakers themselves.
Basically, you got trade-offs, or you gotta "tweak".
How much you willing to spend?

Thanks, willing to spend $2500 used

I think Flrnlamb hits it on the head. The room has everything to do with the sound you receive and a lot of people never hear the true capabilities of a lot of good speakers.
Room correction is complex, timely and sometimes expensive.
You might try a speaker that is lean in the bottom to start with but those room nodes are going to show their ugly head no matter what. EQ degrades the sound in my opinion but sometimes compromises must be made.