I've heard Floyd's quadraphonic surround sound during the '94 tour, but can DD 5.1 be used in the same way? Given that it was developed for home theaters (I assume), does this question even make sense? I read an interesting discussion on this topic recently, and some participants claimed that groups are actually employing DD 5.1 at live shows. But I don't see how this makes sense given that the format is designed to accommodate small satellite speaker systems that divert low frequencies to the LFE channel. Why would a concert venue need to use bass management? Why would it need a LFE channel at all? I realize that more affluent home theater enthusiasts can substitute the satellite-subwoofer combo with five full-range speakers, and perhaps something like this can be done for concerts. However, the concept of applying home theater technology to a large arena seems bizarre to me. Does anyone have more info on this?