Thanks Will! That is good info. Yeah, these seem like the wrong solution for surrounds. I am trying to find something that competes with SVS Ultra Surrounds, which may be overkill as well really. If there is a good solution for less money, that will get me that much closer to getting a third sub for the room...which I now know is your main motivation =]
ps. my Umik should arrive today so I can actually see how bad my room is. I will post graphs when I can get the data put together.