Speaker choice without need for deep bass

@gano: Like I said early, I already prooved that it sounded better (when cutting under 50Hz off the main), so that is NOT a discussion point for this posting. 

With no need for large woofers to handle 20 Hz, there is no need for 3 or more way complex system (and large ugly boxes). Small/slim design should also help. 

Only what (non full range) speakers can handle 50 Hz and up range for a VERY large room. 

Also not the question: what speakers can handle 50 Hz and above at low to medium levels in a very large room. 

Or maybe I should put it even blunter to avoid side tracked discussions: 

Are there any good 2 way speakers out  there that have at least two 6.5" or similar low mid drivers (required IMO to 'feed' the very large room)? 

you can see number of drivers and driver sizes for 100s of speakers here

@kraftwerkturbo wrote: 

"the next speaker design I want to try is a still small speaker but with two low/midrange drivers simply to be able to play at ’concert level’ without distortion; but still no need for very low bass. 

"Since still in the trial and error and validation phase of my ’concept’, any small 2 (if needed 3) way candidate must also fit the VERY low price (used) criteria ($1,000 or less)."

I have been designing speakers specifically for use with subwoofers for close to two decades.  As you mentioned, this frees up the main speakers from needing to handle the low bass, so they can be optimized for the rest of the spectrum.  But the main reason I embrace this approach is that imo there are subwoofer solutions whose in-room performance is significantly better than equivalent-on-paper main speakers in the bottom two octaves.

Unfortunately I have no recommendations on how to achieve "concert level without distortion" above the subwoofer range for less $1000; explore the used speaker offerings on this site and hopefully something will stand out to you.  You might especially look at companies that have a prosound heritage.  JBL and Klipsch come to mind; include Zu because they use prosound-type drivers.  Also look at Tekton; I don't think their Mini Lore is realistically capable of "concert level without distortion", but it probably comes closer than most in its price ballpark.

Very best of luck in your quest!

Duke

what you seek is not very abundant

most bookshelf loudspeakers cant play loud enough to fill up a room of that size

we know of one loudspeaker which will work

https://starkesound.com/detail.html?id=22

can play up to 107db 

107dB max output

55Hz - 28kHz frequency response

( 40 - 250W 4 ohms

89dB efficient  

https://www.audioholics.com/bookshelf-speaker-reviews/starke-sound-ic-h1-elite#:~:text=I%20found%20the%20fit%20and,referred%20to%20by%20Starke%20Sound.

Dave and Troy

Audio intellect NJ

starke sound dealer

https://www.css-audio.com/online-store/CSS-Criton-1TD-X-Kit-Pair-p221163830