W4-656s

I just bought 2 656's from PE. Anyone used these before? This will be my first set of hi-fi D I Y. Im decided on my tweeter selection and box design. I just really liked the freq responce of this driver at the price offered--and I just had to buy a set of drivers or I was going to search and change my mind foever. I want to build a nice set of musical mains for 'our' HT (my gf will call these 'her' speakers) I really dont have any fancy modeling software and dont know where to start as far as tweeter/crossover goes.
Any help would be cool...