I have a pair of 6-1/2" 2-ways that fully energize a room, have excellent power response (uniform frequency response curve throughout the room), are linear to 29 Hz and audible to 26 Hz.
However, they’re no mini-monitors. They’re bipolars, with 6-1/2" woofers facing both front and back, and 1" titanium dome tweeters also facing front and back. The cabinets are 50" tall by 16’ wide by 8" deep and weigh 85 lbs. each. They are the late lamented Mirage M5si's, a product from around 1995. I bought mine on closeout in Oct. (Halloween, actually) 1996.
They have that transparency and purity of a 6-1/2" 2-way minimonitor with the fullness and power of the 85-lb. floorstanders that they are. They just manage to do it in a 2-way configuration. They’re so good at what they do, I’m a bit surprised that they didn’t become the new standard for simple yet effective floorstanders.