Assuming here the OP is referring mainly about stand mount speakers, here is my take.
I have a pair of Klipsch RB-75’s that have 8" woofers and 1.75" compression drivers(titanium) with 8" horns and boy do they play bigger than they have the right to. Strong tight punchy bass, clear articulate midrange, and detailed but not strident treble. Dynamics would be an understatement. They are essentially floorstanders with "bookshelf" cabinets(20.2" x 10" x 11.8", 32lbs). I have owned other bookshelf speakers with 8" woofers but with 1" tweeters and none have the presence, smoothness, and dynamics that the 75’s have. I have the RB-75’s paired with a Klipsch RSW-10d subwoofer in a 4000ft3+ room and the combo has no problem filling the space with some ear punishing dB’s.
With all that said, I do think a well designed 6.5"W/1"T speaker with a smallish sub can hold it’s own in a small/mid sized room with decent dynamics.
Bill
