Thank you

!
This is very helpful. I heard reviews saying the Bookshelves have lots of bass and have no need for a subwoofer for music playback. I simply couldn't believe it, which is why I requested the plots (Thank you again!

).
I am now amazed how the Bookshelves can track the Monitors down to 50Hz. With the influence of additional room gain, won't these two speakers sound identical throughout the entire frequency spectrum?
Also, I'm baffled to see that the Towers and Monitors are identical from 40Hz on down. Again, with typical room gain, won't these two sound identical throughout the entire frequency spectrum (though I see the Towers have more output, ~ 2 dB, from 70 Hz to 400 Hz than the rest)? It now seems from this graph that the Monitors are the bass king (?), even better than the Towers (!). Am I imagining things???