Frequency Response

1) You probably can't hear above 16KHz on music

2) The lower bound is what the speaker will reproduce at a low level, not what it will reproduce at a useable output level so it's meaningless.

Music is made up of a lot of frequencies that by themselves (like a 20khz test tone) may be inaudible, but because it's music, they have a large effect on the sound. High notes can have higher overtones that sweeten the tone overall...most likely why analog (and live music) sounds different than digital, and why a good subwoofer can "charge" a room and make music that otherwise seems to lack low frequency information (mandolins?) sound more natural.

You can't simply isolate the speakers. Are you listening to 'test tones' or music. My speaker have neither a great F Response nor linearity, but many who have heard them would say they're musical. The partnering equipment says a lot about the FR is heard.

I was also in the camp of single full range driver(no crossover) midrange is the King....until one day I realized that music is full spectrum, means you need highs and you need lows, even the super lows to have the full picture....now I am JBL 4350 guy.....so more is better. Go for the most extended and most sensitive you can get.

I am considering Tannoys
93 d/b sensitivity, frequency range of 29hz-22khz @ 6d/b
PS....After a lot of research I have never heard the term linearity until this post.