These impusle responses are created from a simple shoebox the size and shape of the Musikvereinssaal.  They are scaled in plan to 0.5x, 1.0x and 2.5x the real scale, all with the same room height and so RT.  While the energy levels are as expected, there is far less loudness difference in the simulations than there would be in reality.  Perhaps we have much more to learn about creating impulse responses?