I have a pair of Altec 604E's that I am putting together and I am missing crossovers. I'm hoping someone can steer me in the right direction. Since Jeff Markwart never made a XO for the E's what do you guys think about trying to create my own n1500a's. Or should I save myself the headache and just buy the crossovers that GPA sells http://www.greatplainsaudio.com/downloads/N1600-16A.pdf. Any input would be great. I did come across these pictures that looked pretty helpful were I to try to re-create the n1500a's.