1. I use the manufacturers'recommended crossover points and bandpass delay settings.
I verify the settings from the manufacturer if possible . On my BLOG there is a article about 2 brands where with settings mismatch .
http://timobeckmangeluid.wordpress.com/2011/10/02/tanstaafl-there-aintno-such-thing-as-a-free-lunch-statement-i-got-from-b-mccarthy/The sls measurement had a polarity problem with standard settings from the manufacturer . The second had a delay mismatch between the high and low driver within the top .
If you really want to learn about how to analyze the data on screen measuring a sound system read the book by Bob McCarthy or the blue book from meyersound .