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You might notice in the K-system it was mentioned Dolby research indicated a lower reference level for small rooms than for large spaces. There is some qualitative difference in the same loudness in smaller spaces vs larger spaces. I don't know what it is, but wonder if in larger spaces reflections of peak sound levels on impulsive sounds is more spread out in time vs in smaller spaces. Anyway, the research and my experience indicate that in a domestic listening space you in fact don't need or even want to duplicate the SPL levels of a live performance in a larger space even those in a "small" jazz club. At an extreme maybe 120 db SPL peaks sound just as powerful at 105 db SPL peaks in your home in some sense. Or at least it seems such very high level sounds can be overwhelming in a way they aren't in the larger space. This actually is a good thing for us at home.