Realizing that we all have different tastes and desires in our music and how we might listen to it, I just don't understand why so many people are so concerned how it sounds when listening standing up. Obviously I don't want to have to place my head in a vise in order to hear my music at its best, but I listen to it seriously only when sitting in my recliner 10 feet away (about 12 feet or so if I'm reclined), centered between the speakers. If I'm not specifically sitting and listening but doing something else, like reading or eating a meal or standing up, as long as the music sounds decent, I'm perfectly satisfied. Again, to each his own.
Paul