I'm wanting to build a center channel speaker for my home theater and I have two 3 inch woofers and two tweeters. The only problem is I don't have the specs for them. They were given to me from a friend. They came out of a set of Sony tower speakers that were part of a surround sound. I believe they're 6 ohm. How could I figure the size box to build for them and also to build the crossover