I think the richness and liveliness you hear from a well set-up pair of MBLs is due in large measure to the unusually well-energized, spectrally correct reverberant field they generate. In this area, the MBLs replicate the soundfield characteristics of a live performance better than most speakers do; most speakers generate a reverberant field that is much weaker (relative to the direct sound) than one would find at a live performance, and that weak reverberant field is often spectrally dissimilar to the first-arrival sound. MBL isn't the only manuracturer who gives these characteristic high priority.
Duke
dealer/manufacturer
Duke
dealer/manufacturer