Trying to come up with a one-line summation of a question or comment is tough. I hope this one gets some lookers. I've been thinking about getting new speakers, and as I look the possibilities for replacement one of the specs that I'm interested in is speaker sensitivity. At first glance it seems that the more sensitive, the better, but I started thinking about it in more detail, and I wonder if it's that important in a system that will be used primarily for HT, with a receiver which will be crossing over at 80hz. Then I came up with my question: How does eliminating all sub-80hz material from a speakers load affect it's apparent sensitivity? It appears to me that the low frequencies are the ones that have the most to do with overall sensitivity as it's reported by manufacturers, and if we take that burden away from the speaker, that it's effective sensitivity must go up. The question is: how much does it affect the usable headroom? Has anyone given this much thought?