Looking for non-boomy full range speakers

I use a Linar 10, 5.1 integrated SS, sweet Mosfet.
I have had my share of good monitors (Electra 906, SF Signum, Triangle Titus) so I can always go back to the 45Hz and up sound and live with it...but you know what this hobby is all about, finding a solution where there may be none! I was almost there with Totem Arros but found the single 4" dangerously popping at lower volume and still, the lower end (sub 40) was missing.
My experience so far is that yes, a couple of 4.5"-5" max woofers work better than a 6.5", although size is not always an indicator of bass response.
I have to admit that short of the sub 35Hz, Audio Physic Yaras is the real deal and a proof that some Floortsanders were designed to sound good in small room. I may drop the quest and buy myself a tight sub, Yara or REL....but that means a defeat!!!!!

Go with the a good sub-woofer. Properly setup it will sound like full range speakers that match your room. A full range speaker that can really go down to 27Hz will be too much for your small room.

One very often overlooked speaker for this application is the Aerial Model 6. If you have a decent w/ch amp (at least 100), this is a wonderful all-around speaker. Think about it, how many true 3-way speakers do you know of that have 1-tweeter, 1-midrange, and 1-woofer (7 inch) -- most are either 2-way monitors with 2 drivers, 2-way floorstanders with 2 drivers, or multi-way speakers with multi-drivers. The model 6 is truly unique in this way (really ! start looking). (Bass rated to 35 Hz by the way - but it is TRUE - unlike so many that exagerate). Many down-play these speakers because of their LACK of bass (probably because they have big rooms) - untrue, especially for a room like yours. With the model 6 you have a dedicated woofer, with a midrange driver that can focus on its job WITHOUT worrying about bass duties, plus a 3-way crossover designed by Michael Kelly and his excellent heavy cabinetry (again, find a speaker comparable that weighs 60 lbs). While I feel they are a bit over-priced new, especially with any veneer besides black, used prices are obviously easier on the wallet.
I owned these speakers a few years ago and have great respect for them and all of M. Kelly's Aerials. They are excellent sounding. They have quality Bass (the more power the better though). This is a designer that knows his stuff. Check them out !

I don't know anything about your amp, but Revel F-30 (not its replacement, the F-32), Aerial 6, or if you can stretch your budget, the Dynaudio Special 25.

Good monitors (the 25's) would be safest in a smallish room like that -- you could always add a sub, but probably wouldn't need one.

Magneplanar speakers don't boom, but they don't go real low either, although it often sounds like they do. If boom is the primary consideration, consider Maggies.