My WA Scout 112 combo has both. I always thought in the cab tuning business it was one or other for exactly the reason you suggested. In any event, that little (albeit heavy) combo is the best sounding, reasonably portable combo I have ever come across.Interesting, I knew there were some with ports and some with passive radiators, but not both. It appears that there were more versions built than I knew about. Combining ports and passive radiators would be difficult to calculate accurately IME.