I was using the final battle scene in the Avengers BD yesterday to test out the difference between crossover settings of 200Hz, 160Hz, and 120Hz and from a purely subjective viewpoint going from 200Hz to 160Hz made things sound quite a bit clearer and going from 160Hz to 120Hz did even more so. I think since the SW is rated from 28Hz to 200Hz, 200Hz is the extreme limit for the SW and it probably runs out of steam closer to 120Hz. Also, there's probably a reason why the available options are: 40, 60, 80, 100, 110, 120, 160, 200Hz. As you can see, the finest increments (10Hz increments) are between 100 and 120Hz and past that the increments are quite large (40Hz steps) and below that they are somewhat larger (20Hz steps). I think this might be because somewhere around 100Hz to 120Hz (or close) is where the sweet spot is between the upper limits of the SW and the lower limits of the small sats.
So, my ears confirm that 120Hz sounds better than 200Hz (or even 160Hz) for the source material I was using as a reference. I would like to be able to measure the response curve of the speakers in the future, though, since I'm used to making objective decisions/measurements when setting up/calibrating my displays.