I have several test discs that are supposed to help with SW setup. They are good to start with, but the result should not be considered final.
Placement is a trial and error game. Play real music.
Regarding crossover frequency, after long experience I have come to the conclusion that the best setting depends on the particular recording, so I now have a crossover where the frequency is easy to adjust, and I feel free to twist that knob. I range from 50 Hz, for chamber music, to 200-400 Hz for organ music. My subwoofer system is a custom design and can handle higher frequencies than is usual. When I increase the frequency I am really transitioning from planar speakers (MG1.6) to cone drivers which have the "punch" and power handling capability needed for some music.
