Frequency Response

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 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.

Abbys and a NSM15EXP sub hooked up in parallel to speaker taps provides me a full spectrum without a xover.