I am building my own Tower speaker system. I an going to use 4 Eminence Beta 8 with 2 Eminence PSD 2002 horns mounted coaxially.
Please take a look at this crossover...I like it becase it has several attenuation settings as well as settings for the midbase. It seems you can set it leave it alone with having to have an L-Pad switch somewhere.
Please let me know your thoughts http://www.usspeaker.com/beyma%20FD250-1.htm