You are looking at half of the volume that was determined to be needed for those drivers. I would not be optimistic about good sonic quality using half the volume as called for. Perhaps you could find some electronics students at the local high school or technical college to build your crossovers? It is not a very difficult build schematic.
You could also forgo the Encore crossover and buy a pre-built one at about the same crossover point. This one would work and provide adequate performance -
http://www.partsexpress.com/pe/showd...number=260-142