Well in my opinion something always seams enough at the begining then you always want more. Having said that I have always used 12's never in a box yet freeair and they have worked fine. If you are going to put them in a box then I would say port the 10's and seal the 12's. why not try it sealed and if you don't like it then just port it. Better yet why not try an adjustible port I have seen a couple of boxes like that yet kinda tricky to do. Good luck and power them with a good strong amplifier.