I think most of us knew what you meant!Oops. I read the post backward.Sorry about that.

You wouldn't want that rear bass radiator to be closer than a couple of inches to the wall though would you? A lot of speakers end up placed on an actual bookshelf or in a bookcase or alcove. I have a pair on a windowsill in the bedroom. In those cases I wouldn't think you would want any kind of rear port or radiator.The advantage of the F6Bs is that it is cheaper and doesn't break up in bass when pushed. There is no issue about being close or away from wall as in either case, you need EQ for bass region although less modes are excited by F6Bs than F6B due to lower bass output.