Rick. Thanks for the quick reply.
I was planning on going vented, but it is good to know that I can plug the vent and use a subwoofer (if I feel that I need it) and not need to change the XO.
Here is my more significant question: I am wanting a speaker that I can place on the floor and have a maximum height of 65cm. The Tempesta height is circa 55cm, so I could build my own cabinets with a little extra height in them (maintaining the same volume). The big issue is how will these sound mounted lower? I know that you normally recommend 24" (60cm) stands. The vertical and horizontal dispersion characteristics of the Tempestas look amazing, which is what has attracted me to them. My listening position would be 4.5M (14ft) from the speakers.
Rick: Please could you try placing your sample Tempestas on the floor, or on a few books, to find the result. They may not be optimum, but thay may not be bad???