I need to design an xover for a Aura NS3-193, and Seas 27TBFC or 27TDFC, but I do not have any software or experience with this. Can anyone help or point me in the right direction. They will be going in a very slim enclosure (6-7" wide, 30" tall, 4-5" deep, its for a plasma tv). The cutoff I'm looking for on the Aura is around 200hz. [Oh btw, which of these tweeters would you go with, I'm kinda worried about the TBFC's roll off].