^^^^ neither example goes anywhere 60Hz so it would be safe to assume then that the lower the speakers (L/R, center, sats) can go, the better. The upper end doesn't make as much difference because we can't hear over 20-22KHz, right? What is the signifigance of the crossovers at 2.9KHz and 4KHz? In my case, the L/R, center, and sats will be the same size for reasons that aren't important to the general question. If all of the speakers have the same rated response (as they examples above) then leaving the sub at a crossover point of 80Hz will be sufficient?
Edit: Forgot to add but A has a sensitivity (efficiency) of 83dB whereas B has an efficiency of 89dB. I'm looking for a little better loudness, better definition, but still keeping the small bookshelf format. Again, knowing that I'm sacrificing fidelity for the small size. Oh, and the speakers (L/F, center, and sats) are kept at Small.